diff --git a/.github/workflows/pr-checks.yml b/.github/workflows/pr-checks.yml
index 66c75b5..91180b1 100644
--- a/.github/workflows/pr-checks.yml
+++ b/.github/workflows/pr-checks.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest]
-        php-versions: ['8.0','8.2','8.3']
+        php-versions: ['8.0','8.2','8.3', '8.4']
     steps:
     - uses: actions/checkout@v3
 
diff --git a/rector.php b/rector.php
index 5f3c0c8..ab6d739 100644
--- a/rector.php
+++ b/rector.php
@@ -14,7 +14,9 @@
         SimplifyEmptyCheckOnEmptyArrayRector::class,
     ])
     ->withSets([
-        SetList::PHP_80,
+        SetList::PHP_82,
+        SetList::PHP_83,
+        SetList::PHP_84,
         SetList::DEAD_CODE,
         SetList::CODE_QUALITY,
         SetList::CODING_STYLE,
diff --git a/src/Client/SugarApi.php b/src/Client/SugarApi.php
index 27e6f5c..1145714 100644
--- a/src/Client/SugarApi.php
+++ b/src/Client/SugarApi.php
@@ -14,6 +14,7 @@
 use Sugarcrm\REST\Endpoint\MLPackage;
 use Sugarcrm\REST\Endpoint\ModuleLoader;
 use Sugarcrm\REST\Endpoint\Ping;
+use Sugarcrm\REST\Endpoint\Rest;
 use Sugarcrm\REST\Endpoint\Smart;
 use Sugarcrm\REST\Endpoint\SugarBean;
 use Sugarcrm\REST\Endpoint\ModuleFilter;
@@ -48,6 +49,7 @@
  * @method ModuleLoader moduleLoader() -
  * @method MLPackage mlp(string $id = null)
  * @method Integrate integrate(string $module = '', string $id = '')
+ * @method Rest rest(string $endpoint = '')
  */
 class SugarApi extends AbstractClient implements PlatformAwareInterface
 {
diff --git a/src/Endpoint/Abstracts/AbstractSmartSugarEndpoint.php b/src/Endpoint/Abstracts/AbstractSmartSugarEndpoint.php
index 76d46cb..e291ffb 100644
--- a/src/Endpoint/Abstracts/AbstractSmartSugarEndpoint.php
+++ b/src/Endpoint/Abstracts/AbstractSmartSugarEndpoint.php
@@ -6,11 +6,13 @@
 
 namespace Sugarcrm\REST\Endpoint\Abstracts;
 
+use GuzzleHttp\Psr7\Request;
 use MRussell\REST\Endpoint\Data\ValidatedEndpointData;
 use MRussell\REST\Endpoint\SmartEndpoint;
 use MRussell\REST\Traits\PsrLoggerTrait;
 use Sugarcrm\REST\Endpoint\SugarEndpointInterface;
 use Sugarcrm\REST\Endpoint\Traits\CompileRequestTrait;
+use Sugarcrm\REST\Endpoint\Traits\CustomHeadersTrait;
 
 /**
  * Provide a smarter interface for Endpoints, to better manage passed in data
@@ -20,6 +22,12 @@ abstract class AbstractSmartSugarEndpoint extends SmartEndpoint implements Sugar
 {
     use CompileRequestTrait;
     use PsrLoggerTrait;
+    use CustomHeadersTrait;
 
     protected string $_dataInterface = ValidatedEndpointData::class;
+
+    protected function configureRequest(Request $request, $data): Request
+    {
+        return parent::configureRequest($this->addCustomHeadersToRequest($request), $data);
+    }
 }
diff --git a/src/Endpoint/Abstracts/AbstractSugarBeanCollectionEndpoint.php b/src/Endpoint/Abstracts/AbstractSugarBeanCollectionEndpoint.php
index 4fdf5b9..4387cdf 100644
--- a/src/Endpoint/Abstracts/AbstractSugarBeanCollectionEndpoint.php
+++ b/src/Endpoint/Abstracts/AbstractSugarBeanCollectionEndpoint.php
@@ -6,8 +6,10 @@
 
 namespace Sugarcrm\REST\Endpoint\Abstracts;
 
+use GuzzleHttp\Psr7\Request;
 use Sugarcrm\REST\Endpoint\SugarBean;
 use MRussell\REST\Endpoint\Abstracts\AbstractModelEndpoint;
+use Sugarcrm\REST\Endpoint\Traits\CustomHeadersTrait;
 use Sugarcrm\REST\Endpoint\Traits\FieldsDataTrait;
 use Sugarcrm\REST\Endpoint\Traits\ModuleAwareTrait;
 
@@ -22,6 +24,7 @@ abstract class AbstractSugarBeanCollectionEndpoint extends AbstractSugarCollecti
 {
     use FieldsDataTrait;
     use ModuleAwareTrait;
+    use CustomHeadersTrait;
 
     public const SUGAR_ORDERBY_DATA_PROPERTY = 'order_by';
 
@@ -97,6 +100,11 @@ protected function configurePayload(): mixed
         return $this->configureFieldsDataProps($data);
     }
 
+    protected function configureRequest(Request $request, $data): Request
+    {
+        return parent::configureRequest($this->addCustomHeadersToRequest($request), $data);
+    }
+
     /**
      * Add module to url options
      * @inheritdoc
diff --git a/src/Endpoint/Abstracts/AbstractSugarBeanEndpoint.php b/src/Endpoint/Abstracts/AbstractSugarBeanEndpoint.php
index 6557f69..957610b 100644
--- a/src/Endpoint/Abstracts/AbstractSugarBeanEndpoint.php
+++ b/src/Endpoint/Abstracts/AbstractSugarBeanEndpoint.php
@@ -22,6 +22,7 @@
 use Sugarcrm\REST\Endpoint\Integrate;
 use Sugarcrm\REST\Endpoint\SugarEndpointInterface;
 use Sugarcrm\REST\Endpoint\Traits\CompileRequestTrait;
+use Sugarcrm\REST\Endpoint\Traits\CustomHeadersTrait;
 use Sugarcrm\REST\Endpoint\Traits\FieldsDataTrait;
 use Sugarcrm\REST\Endpoint\Traits\IntegrateSyncKeyTrait;
 use Sugarcrm\REST\Endpoint\Traits\ModuleAwareTrait;
@@ -53,6 +54,7 @@ abstract class AbstractSugarBeanEndpoint extends ModelEndpoint implements SugarE
     use FieldsDataTrait;
     use FileUploadsTrait;
     use IntegrateSyncKeyTrait;
+    use CustomHeadersTrait;
 
     public const MODEL_ACTION_VAR = 'action';
 
@@ -173,7 +175,7 @@ protected function configureRequest(Request $request, $data): Request
             $data = $this->configureFieldsDataProps($data);
         }
 
-        return parent::configureRequest($request, $data);
+        return parent::configureRequest($this->addCustomHeadersToRequest($request), $data);
     }
 
     /**
diff --git a/src/Endpoint/Abstracts/AbstractSugarCollectionEndpoint.php b/src/Endpoint/Abstracts/AbstractSugarCollectionEndpoint.php
index 810f363..6dbdff5 100644
--- a/src/Endpoint/Abstracts/AbstractSugarCollectionEndpoint.php
+++ b/src/Endpoint/Abstracts/AbstractSugarCollectionEndpoint.php
@@ -6,6 +6,7 @@
 
 namespace Sugarcrm\REST\Endpoint\Abstracts;
 
+use GuzzleHttp\Psr7\Request;
 use MRussell\REST\Exception\Endpoint\InvalidRequest;
 use GuzzleHttp\Psr7\Response;
 use MRussell\REST\Endpoint\Data\AbstractEndpointData;
@@ -13,6 +14,7 @@
 use MRussell\REST\Traits\PsrLoggerTrait;
 use Sugarcrm\REST\Endpoint\SugarEndpointInterface;
 use Sugarcrm\REST\Endpoint\Traits\CompileRequestTrait;
+use Sugarcrm\REST\Endpoint\Traits\CustomHeadersTrait;
 
 /**
  * Provides access to a multi-bean collection retrieved from Sugar 7 REST Api
@@ -23,6 +25,7 @@ abstract class AbstractSugarCollectionEndpoint extends CollectionEndpoint implem
 {
     use CompileRequestTrait;
     use PsrLoggerTrait;
+    use CustomHeadersTrait;
 
     public const SUGAR_OFFSET_PROPERTY = 'offset';
 
@@ -82,6 +85,11 @@ protected function configurePayload(): mixed
         return $data;
     }
 
+    protected function configureRequest(Request $request, $data): Request
+    {
+        return parent::configureRequest($this->addCustomHeadersToRequest($request), $data);
+    }
+
     /**
      * Get the configured offset
      */
diff --git a/src/Endpoint/Abstracts/AbstractSugarEndpoint.php b/src/Endpoint/Abstracts/AbstractSugarEndpoint.php
index bd147cc..489a204 100644
--- a/src/Endpoint/Abstracts/AbstractSugarEndpoint.php
+++ b/src/Endpoint/Abstracts/AbstractSugarEndpoint.php
@@ -6,10 +6,12 @@
 
 namespace Sugarcrm\REST\Endpoint\Abstracts;
 
+use GuzzleHttp\Psr7\Request;
 use MRussell\REST\Endpoint\Endpoint;
 use MRussell\REST\Traits\PsrLoggerTrait;
 use Sugarcrm\REST\Endpoint\SugarEndpointInterface;
 use Sugarcrm\REST\Endpoint\Traits\CompileRequestTrait;
+use Sugarcrm\REST\Endpoint\Traits\CustomHeadersTrait;
 
 /**
  * Base Sugar API Endpoint for the simplest of REST functionality
@@ -19,4 +21,10 @@ abstract class AbstractSugarEndpoint extends Endpoint implements SugarEndpointIn
 {
     use CompileRequestTrait;
     use PsrLoggerTrait;
+    use CustomHeadersTrait;
+
+    protected function configureRequest(Request $request, $data): Request
+    {
+        return parent::configureRequest($this->addCustomHeadersToRequest($request), $data);
+    }
 }
diff --git a/src/Endpoint/Data/Filters/AbstractPredefinedFilter.php b/src/Endpoint/Data/Filters/AbstractPredefinedFilter.php
new file mode 100644
index 0000000..86d87d0
--- /dev/null
+++ b/src/Endpoint/Data/Filters/AbstractPredefinedFilter.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters;
+
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\AbstractOperator;
+
+abstract class AbstractPredefinedFilter extends AbstractOperator
+{
+    public function __construct(array $arguments = [])
+    {
+        if (!empty($arguments) && count($arguments) < 2) {
+            $arguments = [
+                $this->getOperator(),
+                $arguments[0] ?? '',
+            ];
+        }
+
+        parent::__construct($arguments);
+    }
+
+    public function compile(): array
+    {
+        return [
+            $this->getOperator() => $this->getValue(),
+        ];
+    }
+}
diff --git a/src/Endpoint/Data/Filters/Creator.php b/src/Endpoint/Data/Filters/Creator.php
new file mode 100644
index 0000000..4faaed3
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Creator.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters;
+
+class Creator extends AbstractPredefinedFilter
+{
+    public const OPERATOR = '$creator';
+}
diff --git a/src/Endpoint/Data/Filters/Expression/AbstractExpression.php b/src/Endpoint/Data/Filters/Expression/AbstractExpression.php
index 5409298..54e960f 100644
--- a/src/Endpoint/Data/Filters/Expression/AbstractExpression.php
+++ b/src/Endpoint/Data/Filters/Expression/AbstractExpression.php
@@ -6,7 +6,12 @@
 
 namespace Sugarcrm\REST\Endpoint\Data\Filters\Expression;
 
+use Sugarcrm\REST\Endpoint\Data\Filters\Creator;
+use Sugarcrm\REST\Endpoint\Data\Filters\Favorite;
+use Sugarcrm\REST\Endpoint\Data\Filters\Following;
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\Equals;
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\InRadiusFromCoords;
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\InRadiusFromZip;
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\NotEquals;
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\Starts;
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\Ends;
@@ -22,6 +27,8 @@
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\Between;
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\DateBetween;
 use Sugarcrm\REST\Endpoint\Data\Filters\FilterInterface;
+use Sugarcrm\REST\Endpoint\Data\Filters\Owner;
+use Sugarcrm\REST\Endpoint\Data\Filters\Tracker;
 use Sugarcrm\REST\Exception\Filter\UnknownFilterOperator;
 
 /**
@@ -29,41 +36,43 @@
  * @package Sugarcrm\REST\Endpoint\Data\Filters\Expression
  * @method AndExpression        and()
  * @method OrExpression         or()
- * @method DateExpression       date($field)
- * @method $this                equals($field,$value)
- * @method $this                notEquals($field,$value)
- * @method $this                starts($field,$value)
- * @method $this                ends($field,$value)
- * @method $this                contains($field,$value)
- * @method $this                in($field,array $value)
- * @method $this                notIn($field,array $value)
- * @method $this                isNull($field)
- * @method $this                notNull($field)
- * @method $this                lt($field,$value)
- * @method $this                lessThan($field,$value)
- * @method $this                lte($field,$value)
- * @method $this                lessThanOrEqualTo($field,$value)
- * @method $this                lessThanOrEquals($field,$value)
- * @method $this                greaterThan($field,$value)
- * @method $this                gte($field,$value)
- * @method $this                greaterThanOrEqualTo($field,$value)
- * @method $this                greaterThanOrEquals($field,$value)
- * @method $this                between($field,$value)
- * @method $this                dateBetween($field,$value)
+ * @method DateExpression       date(string $field)
+ * @method DistanceExpression   distance(string $field)
+ * @method static                equals(string $field, mixed $value)
+ * @method static                notEquals(string $field, mixed $value)
+ * @method static                starts(string $field,mixed $value)
+ * @method static                ends(string $field, mixed $value)
+ * @method static                contains(string $field, mixed $value)
+ * @method static                in(string $field, array $value)
+ * @method static                notIn(string $field, array $value)
+ * @method static                isNull(string $field)
+ * @method static                notNull(string $field)
+ * @method static                lt(string $field,int|float $value)
+ * @method static                lessThan(string $field, int|float $value)
+ * @method static                lte(string $field, int|float $value)
+ * @method static                lessThanOrEqualTo(string $field, int|float $value)
+ * @method static                lessThanOrEquals(string $field, int|float $value)
+ * @method static                greaterThan(string $field, int|float $value)
+ * @method static                gte(string $field, int|float $value)
+ * @method static                greaterThanOrEqualTo(string $field, int|float $value)
+ * @method static                greaterThanOrEquals(string $field, int|float$value)
+ * @method static                between(string $field, array $value)
+ * @method static                dateBetween(string $field,array $value)
+ * @method static                inRadiusFromCoords(string $field, array $coords, int|float $radius, string $unitType = 'km')
+ * @method static                inRadiusFromZip(string $field, string $zip, int|float $radius, string $country, string $unitType = 'km')
+ * @method static                favorite()
+ * @method static                following()
+ * @method static                owner()
+ * @method static                creator()
+ * @method static                tracker(string $interval)
  */
 abstract class AbstractExpression implements FilterInterface, ExpressionInterface
 {
-    /**
-     * @var array
-     */
-    protected $filters = [];
+    protected array $filters = [];
 
-    private ?\Sugarcrm\REST\Endpoint\Data\Filters\Expression\AbstractExpression $parentExpression = null;
+    private AbstractExpression $parentExpression;
 
-    /**
-     * @var array
-     */
-    protected $operators = [
+    protected array $operators = [
         'equals' => Equals::class,
         'notEquals' => NotEquals::class,
         'starts' => Starts::class,
@@ -85,15 +94,20 @@ abstract class AbstractExpression implements FilterInterface, ExpressionInterfac
         'greaterThanOrEquals' => GreaterThanOrEqual::class,
         'between' => Between::class,
         'dateBetween' => DateBetween::class,
+        'inRadiusFromCoords' => InRadiusFromCoords::class,
+        'inRadiusFromZip' => InRadiusFromZip::class,
+        'favorite' => Favorite::class,
+        'following' => Following::class,
+        'owner' => Owner::class,
+        'tracker' => Tracker::class,
+        'creator' => Creator::class,
     ];
 
-    /**
-     * @var array
-     */
-    protected $expressions = [
+    protected array $expressions = [
         'and' => AndExpression::class,
         'or' => OrExpression::class,
         'date' => DateExpression::class,
+        'distance' => DistanceExpression::class,
     ];
 
     /**
@@ -126,7 +140,7 @@ public function __call($name, $arguments)
      * Sets Parent Expression to allow for nested tree structure
      * @return $this
      */
-    public function setParentExpression(AbstractExpression $Expression)
+    public function setParentExpression(AbstractExpression $Expression): static
     {
         $this->parentExpression = $Expression;
         return $this;
@@ -156,7 +170,7 @@ public function compile(): array
     /**
      * @inheritDoc
      */
-    public function clear()
+    public function clear(): static
     {
         $this->filters = [];
         return $this;
diff --git a/src/Endpoint/Data/Filters/Expression/DateExpression.php b/src/Endpoint/Data/Filters/Expression/DateExpression.php
index 68fed69..7322808 100644
--- a/src/Endpoint/Data/Filters/Expression/DateExpression.php
+++ b/src/Endpoint/Data/Filters/Expression/DateExpression.php
@@ -16,7 +16,7 @@
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\GreaterThanOrEqual;
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\DateBetween;
 use Sugarcrm\REST\Endpoint\Data\Filters\Operator\DateRange;
-use Sugarcrm\REST\Exception\Filter\MissingFieldForDateExpression;
+use Sugarcrm\REST\Exception\Filter\MissingFieldForFilterExpression;
 use Sugarcrm\REST\Exception\Filter\UnknownFilterOperator;
 
 /**
@@ -54,9 +54,9 @@ class DateExpression extends AbstractExpression
 {
     public const OPERATOR = '';
 
-    protected $dateField;
+    protected string $dateField;
 
-    protected $ranges = [
+    protected array $ranges = [
         'yesterday' => 'yesterday',
         'today' => 'today',
         'tomorrow' => 'tomorrow',
@@ -72,10 +72,7 @@ class DateExpression extends AbstractExpression
         'nextYear' => 'next_year',
     ];
 
-    /**
-     * @var array
-     */
-    protected $operators = [
+    protected array $operators = [
         'equals' => Equals::class,
         'notEquals' => NotEquals::class,
         'isNull' => IsNull::class,
@@ -94,10 +91,7 @@ class DateExpression extends AbstractExpression
         'between' => DateBetween::class,
     ];
 
-    /**
-     * @var array
-     */
-    protected $expressions = [];
+    protected array $expressions = [];
 
     /**
      * DateExpression constructor.
@@ -114,21 +108,32 @@ public function __construct(array $arguments = [])
      * @param $field
      * @return $this
      */
-    public function field($field): self
+    public function field(string $field): self
     {
         $this->dateField = $field;
         return $this;
     }
 
+    protected function isDateRange(string $name): string|false
+    {
+        $range = false;
+        if (array_key_exists($name, $this->ranges)) {
+            $range = $this->ranges[$name];
+        } elseif (in_array($name, $this->ranges)) {
+            $range = $name;
+        }
+
+        return $range;
+    }
+
     public function __call($name, $arguments)
     {
         if (empty($this->dateField)) {
-            throw new MissingFieldForDateExpression();
+            throw new MissingFieldForFilterExpression();
         }
 
         $args = [$this->dateField];
-        if (array_key_exists($name, $this->ranges)) {
-            $range = $this->ranges[$name];
+        if ($range = $this->isDateRange($name)) {
             $args[] = $range;
             $Op = new DateRange($args);
             $this->filters[0] = $Op;
diff --git a/src/Endpoint/Data/Filters/Expression/DistanceExpression.php b/src/Endpoint/Data/Filters/Expression/DistanceExpression.php
new file mode 100644
index 0000000..26f295a
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Expression/DistanceExpression.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters\Expression;
+
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\InRadiusFromCoords;
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\InRadiusFromZip;
+use Sugarcrm\REST\Exception\Filter\MissingFieldForFilterExpression;
+use Sugarcrm\REST\Exception\Filter\UnknownFilterOperator;
+
+/**
+ * Class DistanceExpression
+ * @package Sugarcrm\REST\Endpoint\Data\Filters\Expression
+ *
+ * @method DistanceExpression radiusFromZip(string $zipCode, string $country = 'US', float $radius = 0, string $unitType = 'km')
+ * @method DistanceExpression radiusFromCoords(float|array $latitude, float|null $longitude = null, float $radius = 0, string $unitType = 'km')
+ */
+class DistanceExpression extends AbstractExpression
+{
+    protected array $operators = [
+        'radiusFromZip' => InRadiusFromZip::class,
+        'radiusFromCoords' => InRadiusFromCoords::class,
+    ];
+
+    protected array $expressions = [];
+
+    protected string $distanceField;
+
+    /**
+     * DateExpression constructor.
+     */
+    public function __construct(array $arguments = [])
+    {
+        if (isset($arguments[0])) {
+            $this->field($arguments[0]);
+        }
+    }
+
+    /**
+     * Set the field that date expression is against
+     * @param $field
+     * @return $this
+     */
+    public function field(string $field): self
+    {
+        $this->distanceField = $field;
+        return $this;
+    }
+
+    public function __call($name, $arguments)
+    {
+        if (empty($this->distanceField)) {
+            throw new MissingFieldForFilterExpression();
+        }
+
+        $args = [$this->distanceField];
+        if (array_key_exists($name, $this->operators)) {
+            $args = array_merge($args, $arguments);
+            $Operator = $this->operators[$name];
+            $O = new $Operator($args);
+            $this->filters[0] = $O;
+            return $this;
+        }
+
+        throw new UnknownFilterOperator([$name]);
+    }
+
+    /**
+     * Human Friendly Expression End, allow you to traverse back up the Filter expression
+     * @codeCoverageIgnore
+     */
+    public function endDistance(): AbstractExpression
+    {
+        return $this->getParentExpression();
+    }
+}
diff --git a/src/Endpoint/Data/Filters/Expression/ExpressionInterface.php b/src/Endpoint/Data/Filters/Expression/ExpressionInterface.php
index 47c5e18..145dad8 100644
--- a/src/Endpoint/Data/Filters/Expression/ExpressionInterface.php
+++ b/src/Endpoint/Data/Filters/Expression/ExpressionInterface.php
@@ -6,20 +6,17 @@
 
 namespace Sugarcrm\REST\Endpoint\Data\Filters\Expression;
 
+use Sugarcrm\REST\Endpoint\Data\Filters\FilterInterface;
+
 /**
  * The Expression Interface defines the basic API needed for an Expression object used in the Filter API Data Layer
  * @package Sugarcrm\REST\Endpoint\Data\Filters\Expression
  **/
-interface ExpressionInterface
+interface ExpressionInterface extends FilterInterface
 {
-    /**
-     * Compiles the Filter Expression into an array to be passed to Sugar Filter API
-     */
-    public function compile(): array;
-
     /**
      * Clear out Filters included in Expression
      * @return $this
      */
-    public function clear();
+    public function clear(): static;
 }
diff --git a/src/Endpoint/Data/Filters/Favorite.php b/src/Endpoint/Data/Filters/Favorite.php
new file mode 100644
index 0000000..fe8f086
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Favorite.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters;
+
+class Favorite extends AbstractPredefinedFilter
+{
+    public const OPERATOR = '$favorite';
+}
diff --git a/src/Endpoint/Data/Filters/Following.php b/src/Endpoint/Data/Filters/Following.php
new file mode 100644
index 0000000..dd5e9cc
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Following.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters;
+
+class Following extends AbstractPredefinedFilter
+{
+    public const OPERATOR = '$following';
+}
diff --git a/src/Endpoint/Data/Filters/Operator/AbstractOperator.php b/src/Endpoint/Data/Filters/Operator/AbstractOperator.php
index a42e61c..3b44783 100644
--- a/src/Endpoint/Data/Filters/Operator/AbstractOperator.php
+++ b/src/Endpoint/Data/Filters/Operator/AbstractOperator.php
@@ -16,21 +16,18 @@ abstract class AbstractOperator implements FilterInterface
 {
     /**
      * The Sugar Operator representation
-     * @var string
      */
-    protected static $_OPERATOR = '';
+    protected string $operator;
 
     /**
      * The field the Operator applies to
-     * @var string
      */
-    protected $field;
+    protected string $field;
 
     /**
      * The value being the Operator compares to
-     * @var mixed
      */
-    protected $value;
+    protected mixed $value;
 
 
     public function __construct(array $arguments = [])
@@ -48,24 +45,28 @@ public function __construct(array $arguments = [])
         }
     }
 
+    public function getOperator(): string
+    {
+        return $this->operator ?? static::OPERATOR;
+    }
+
     /**
      * Set the field on the Operator
      * @param $field string
      * @return $this
      */
-    public function setField($field)
+    public function setField(string $field): static
     {
-        $this->field = (string) $field;
+        $this->field = $field;
         return $this;
     }
 
     /**
      * Get the field configured on the Operator
-     * @return string
      */
-    public function getField()
+    public function getField(): string
     {
-        return $this->field;
+        return $this->field ?? '';
     }
 
     /**
@@ -73,7 +74,7 @@ public function getField()
      * @param $value
      * @return $this
      */
-    public function setValue($value)
+    public function setValue(mixed $value): static
     {
         $this->value = $value;
         return $this;
@@ -81,11 +82,10 @@ public function setValue($value)
 
     /**
      * Get the value configure on the Operator
-     * @return mixed
      */
-    public function getValue()
+    public function getValue(): mixed
     {
-        return $this->value;
+        return $this->value ?? null;
     }
 
     /**
@@ -95,7 +95,7 @@ public function compile(): array
     {
         return [
             $this->getField() => [
-                static::$_OPERATOR => $this->getValue(),
+                $this->getOperator() => $this->getValue(),
             ],
         ];
     }
diff --git a/src/Endpoint/Data/Filters/Operator/Between.php b/src/Endpoint/Data/Filters/Operator/Between.php
index 9f94c3c..cab9b69 100644
--- a/src/Endpoint/Data/Filters/Operator/Between.php
+++ b/src/Endpoint/Data/Filters/Operator/Between.php
@@ -12,6 +12,4 @@
 class Between extends AbstractOperator
 {
     public const OPERATOR = '$between';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/Contains.php b/src/Endpoint/Data/Filters/Operator/Contains.php
index 48256d7..b145a47 100644
--- a/src/Endpoint/Data/Filters/Operator/Contains.php
+++ b/src/Endpoint/Data/Filters/Operator/Contains.php
@@ -12,6 +12,4 @@
 class Contains extends AbstractOperator
 {
     public const OPERATOR = '$contains';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/DateBetween.php b/src/Endpoint/Data/Filters/Operator/DateBetween.php
index ffd3eee..f2b74ea 100644
--- a/src/Endpoint/Data/Filters/Operator/DateBetween.php
+++ b/src/Endpoint/Data/Filters/Operator/DateBetween.php
@@ -12,6 +12,4 @@
 class DateBetween extends AbstractOperator
 {
     public const OPERATOR = '$dateBetween';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/DateRange.php b/src/Endpoint/Data/Filters/Operator/DateRange.php
index 2152eef..58d16f9 100644
--- a/src/Endpoint/Data/Filters/Operator/DateRange.php
+++ b/src/Endpoint/Data/Filters/Operator/DateRange.php
@@ -12,6 +12,4 @@
 class DateRange extends AbstractOperator
 {
     public const OPERATOR = '$dateRange';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/Ends.php b/src/Endpoint/Data/Filters/Operator/Ends.php
index 848a2b6..8c404ad 100644
--- a/src/Endpoint/Data/Filters/Operator/Ends.php
+++ b/src/Endpoint/Data/Filters/Operator/Ends.php
@@ -12,6 +12,4 @@
 class Ends extends AbstractOperator
 {
     public const OPERATOR = '$ends';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/Equals.php b/src/Endpoint/Data/Filters/Operator/Equals.php
index 089aca8..65d6825 100644
--- a/src/Endpoint/Data/Filters/Operator/Equals.php
+++ b/src/Endpoint/Data/Filters/Operator/Equals.php
@@ -12,6 +12,4 @@
 class Equals extends AbstractOperator
 {
     public const OPERATOR = '$equals';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/GreaterThan.php b/src/Endpoint/Data/Filters/Operator/GreaterThan.php
index 0dc9427..0e3cc2e 100644
--- a/src/Endpoint/Data/Filters/Operator/GreaterThan.php
+++ b/src/Endpoint/Data/Filters/Operator/GreaterThan.php
@@ -12,6 +12,4 @@
 class GreaterThan extends AbstractOperator
 {
     public const OPERATOR = '$gt';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/GreaterThanOrEqual.php b/src/Endpoint/Data/Filters/Operator/GreaterThanOrEqual.php
index c19fe07..21c48c4 100644
--- a/src/Endpoint/Data/Filters/Operator/GreaterThanOrEqual.php
+++ b/src/Endpoint/Data/Filters/Operator/GreaterThanOrEqual.php
@@ -12,6 +12,4 @@
 class GreaterThanOrEqual extends AbstractOperator
 {
     public const OPERATOR = '$gte';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/In.php b/src/Endpoint/Data/Filters/Operator/In.php
index 1639c29..3b2c9c8 100644
--- a/src/Endpoint/Data/Filters/Operator/In.php
+++ b/src/Endpoint/Data/Filters/Operator/In.php
@@ -12,6 +12,4 @@
 class In extends AbstractOperator
 {
     public const OPERATOR = '$in';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/InRadiusFromCoords.php b/src/Endpoint/Data/Filters/Operator/InRadiusFromCoords.php
new file mode 100644
index 0000000..e131fb5
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Operator/InRadiusFromCoords.php
@@ -0,0 +1,138 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters\Operator;
+
+class InRadiusFromCoords extends AbstractOperator
+{
+    use MapFilterOperatorTrait;
+    public const PARAM_LATITUDE = 'latitude';
+
+    public const PARAM_LONGITUDE = 'longitude';
+
+    public const PARAM_RADIUS = 'radius';
+
+    public const PARAM_UNIT = 'unitType';
+
+    public const OPERATOR = '$in_radius_from_coords';
+
+    protected float $latitude;
+
+    protected float $longitude;
+
+    public function __construct(array $arguments = [])
+    {
+        parent::__construct($arguments);
+        if (!empty($arguments)) {
+            $params = array_slice($arguments, 1);
+            if (count($params) > 1) {
+                $this->configureParams($params);
+            }
+        }
+    }
+
+    public function setLatitude(float $latitude): static
+    {
+        $this->latitude = $latitude;
+        return $this;
+    }
+
+    public function setLongitude(float $longitude): static
+    {
+        $this->longitude = $longitude;
+        return $this;
+    }
+
+    public function setCoordinates(array $coordinates): static
+    {
+        $latitude = $coordinates[self::PARAM_LATITUDE] ?? $coordinates[0] ?? null;
+        if ($latitude) {
+            $this->setLatitude((float) $latitude);
+        }
+
+        $longitude = $coordinates[self::PARAM_LONGITUDE] ?? $coordinates[1] ?? null;
+        if ($longitude) {
+            $this->setLongitude((float) $longitude);
+        }
+
+        return $this;
+    }
+
+    private function makeValue(): array
+    {
+        return [
+            self::PARAM_LATITUDE => $this->latitude ?? 0,
+            self::PARAM_LONGITUDE => $this->longitude ?? 0,
+            self::PARAM_RADIUS => $this->radius ?? 0,
+            self::PARAM_UNIT => $this->unitType ?? 'km',
+        ];
+    }
+
+    private function configureParams(array $params): static
+    {
+        $i = 0;
+        if (isset($params[$i]) && is_array($params[$i])) {
+            // Coordinate array
+            $this->setCoordinates($params[$i]);
+            if ($params[1] === null) {
+                // longitude param is null, so radius is at i+2
+                $i++;
+            }
+        } else {
+            $this->setCoordinates($params);
+            $longI = 1;
+            if (isset($params[$longI]) && $params[$longI] === $this->longitude) {
+                $i++;
+            }
+        }
+
+        $i++;
+        $radius = $params[self::PARAM_RADIUS] ?? $params[$i] ?? null;
+        if ($radius) {
+            $this->setRadius((float) $radius);
+        }
+
+        $unitType = $params[self::PARAM_UNIT] ?? $params[$i + 1] ?? null;
+        if (!empty($unitType)) {
+            $this->setUnitType($unitType);
+        }
+
+        $this->value = $this->makeValue();
+        return $this;
+    }
+
+    public function getValue(): mixed
+    {
+        if (empty($this->value)) {
+            $this->value = $this->makeValue();
+        }
+
+        return parent::getValue();
+    }
+
+    /**
+     * Set the Value on the Operator
+     * @param $value
+     * @return $this
+     */
+    public function setValue(mixed $value): static
+    {
+        if (is_array($value)) {
+            $this->configureParams($value);
+        }
+
+        $this->value = $this->makeValue();
+        return $this;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function compile(): array
+    {
+        return [
+            $this->getField() => [
+                $this->getOperator() => $this->getValue(),
+            ],
+        ];
+    }
+}
diff --git a/src/Endpoint/Data/Filters/Operator/InRadiusFromZip.php b/src/Endpoint/Data/Filters/Operator/InRadiusFromZip.php
new file mode 100644
index 0000000..48263c2
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Operator/InRadiusFromZip.php
@@ -0,0 +1,116 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters\Operator;
+
+class InRadiusFromZip extends AbstractOperator
+{
+    use MapFilterOperatorTrait;
+    public const PARAM_COUNTRY = 'countries';
+
+    public const PARAM_ZIP = 'zipCode';
+
+    public const OPERATOR = '$in_radius_from_zip';
+
+    protected string $zipCode;
+
+    protected string $country;
+
+    public function __construct(array $arguments = [])
+    {
+        parent::__construct($arguments);
+        if (!empty($arguments)) {
+            $params = array_slice($arguments, 1);
+            if (count($params) > 1) {
+                $this->configureParams($params);
+            }
+        }
+    }
+
+    public function setZipCode(string $zipCode): static
+    {
+        $this->zipCode = $zipCode;
+        return $this;
+    }
+
+    public function setCountry(string $country): static
+    {
+        $this->country = $country;
+        return $this;
+    }
+
+    private function makeValue(): array
+    {
+        return [
+            self::PARAM_ZIP => $this->zipCode ?? 0,
+            self::PARAM_COUNTRY => $this->country ?? "US",
+            InRadiusFromCoords::PARAM_RADIUS => $this->radius ?? 0,
+            InRadiusFromCoords::PARAM_UNIT => $this->unitType ?? 'km',
+        ];
+    }
+
+    private function configureParams(array $params): static
+    {
+        $zip = $params[self::PARAM_ZIP] ?? $params[0] ?? null;
+        if ($zip) {
+            $this->setZipCode((string) $zip);
+        }
+
+        $country = $params[self::PARAM_COUNTRY] ?? $params[1] ?? null;
+        if ($country) {
+            $this->setCountry((string) $country);
+        }
+
+        $radius = $params[InRadiusFromCoords::PARAM_RADIUS] ?? $params[2] ?? null;
+        if ($radius) {
+            $this->setRadius((float) $radius);
+        }
+
+        $unitType = $params[InRadiusFromCoords::PARAM_UNIT] ?? $params[3] ?? null;
+        if (!empty($unitType)) {
+            $this->setUnitType($unitType);
+        }
+
+        $this->value = $this->makeValue();
+        return $this;
+    }
+
+    public function getValue(): mixed
+    {
+        if (empty($this->value)) {
+            $this->value = $this->makeValue();
+        }
+
+        return parent::getValue();
+    }
+
+    /**
+     * Set the Value on the Operator
+     * @param $value
+     * @return $this
+     */
+    public function setValue(mixed $value): static
+    {
+        if (is_array($value)) {
+            $this->configureParams($value);
+        } else {
+            $this->setZipCode((string) $value);
+        }
+
+        $this->value = $this->makeValue();
+        return $this;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function compile(): array
+    {
+        return [
+            $this->getField() => [
+                $this->getOperator() => $this->getValue(),
+            ],
+        ];
+    }
+
+
+}
diff --git a/src/Endpoint/Data/Filters/Operator/IsNull.php b/src/Endpoint/Data/Filters/Operator/IsNull.php
index 1558839..d4b55da 100644
--- a/src/Endpoint/Data/Filters/Operator/IsNull.php
+++ b/src/Endpoint/Data/Filters/Operator/IsNull.php
@@ -13,9 +13,7 @@ class IsNull extends AbstractOperator
 {
     public const OPERATOR = '$is_null';
 
-    protected static $_OPERATOR = self::OPERATOR;
-
-    public function setValue($value): self
+    public function setValue(mixed $value): static
     {
         $this->value = null;
         return $this;
@@ -24,7 +22,7 @@ public function setValue($value): self
     public function compile(): array
     {
         return [
-            $this->getField() => [static::$_OPERATOR],
+            $this->getField() => [ $this->getOperator() ],
         ];
     }
 }
diff --git a/src/Endpoint/Data/Filters/Operator/LessThan.php b/src/Endpoint/Data/Filters/Operator/LessThan.php
index 685038c..f8e852c 100644
--- a/src/Endpoint/Data/Filters/Operator/LessThan.php
+++ b/src/Endpoint/Data/Filters/Operator/LessThan.php
@@ -12,6 +12,4 @@
 class LessThan extends AbstractOperator
 {
     public const OPERATOR = '$lt';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/LessThanOrEqual.php b/src/Endpoint/Data/Filters/Operator/LessThanOrEqual.php
index 1a9a3d4..ea9d4a6 100644
--- a/src/Endpoint/Data/Filters/Operator/LessThanOrEqual.php
+++ b/src/Endpoint/Data/Filters/Operator/LessThanOrEqual.php
@@ -12,6 +12,4 @@
 class LessThanOrEqual extends AbstractOperator
 {
     public const OPERATOR = '$lte';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/MapFilterOperatorTrait.php b/src/Endpoint/Data/Filters/Operator/MapFilterOperatorTrait.php
new file mode 100644
index 0000000..fe664f5
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Operator/MapFilterOperatorTrait.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters\Operator;
+
+trait MapFilterOperatorTrait
+{
+    protected string $unitType = 'km';
+
+    protected float $radius;
+
+    public function setRadius(float $radius): static
+    {
+        $this->radius = $radius;
+        return $this;
+    }
+
+    public function setUnitType(string $unitType): static
+    {
+        $this->unitType = $unitType;
+        return $this;
+    }
+}
diff --git a/src/Endpoint/Data/Filters/Operator/NotEquals.php b/src/Endpoint/Data/Filters/Operator/NotEquals.php
index a1778de..ca32109 100644
--- a/src/Endpoint/Data/Filters/Operator/NotEquals.php
+++ b/src/Endpoint/Data/Filters/Operator/NotEquals.php
@@ -12,6 +12,4 @@
 class NotEquals extends AbstractOperator
 {
     public const OPERATOR = '$not_equals';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/NotIn.php b/src/Endpoint/Data/Filters/Operator/NotIn.php
index db5912f..12d08af 100644
--- a/src/Endpoint/Data/Filters/Operator/NotIn.php
+++ b/src/Endpoint/Data/Filters/Operator/NotIn.php
@@ -13,6 +13,4 @@
 class NotIn extends AbstractOperator
 {
     public const OPERATOR = '$not_in';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/NotNull.php b/src/Endpoint/Data/Filters/Operator/NotNull.php
index fa32177..d4bd8c2 100644
--- a/src/Endpoint/Data/Filters/Operator/NotNull.php
+++ b/src/Endpoint/Data/Filters/Operator/NotNull.php
@@ -12,6 +12,4 @@
 class NotNull extends IsNull
 {
     public const OPERATOR = '$not_null';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Operator/Starts.php b/src/Endpoint/Data/Filters/Operator/Starts.php
index 9f42fbd..12b4d83 100644
--- a/src/Endpoint/Data/Filters/Operator/Starts.php
+++ b/src/Endpoint/Data/Filters/Operator/Starts.php
@@ -12,6 +12,4 @@
 class Starts extends AbstractOperator
 {
     public const OPERATOR = '$starts';
-
-    protected static $_OPERATOR = self::OPERATOR;
 }
diff --git a/src/Endpoint/Data/Filters/Owner.php b/src/Endpoint/Data/Filters/Owner.php
new file mode 100644
index 0000000..06c3acd
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Owner.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters;
+
+class Owner extends AbstractPredefinedFilter
+{
+    public const OPERATOR = '$owner';
+}
diff --git a/src/Endpoint/Data/Filters/Tracker.php b/src/Endpoint/Data/Filters/Tracker.php
new file mode 100644
index 0000000..7e80cf1
--- /dev/null
+++ b/src/Endpoint/Data/Filters/Tracker.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Data\Filters;
+
+class Tracker extends AbstractPredefinedFilter
+{
+    public const OPERATOR = '$tracker';
+}
diff --git a/src/Endpoint/Provider/SugarEndpointProvider.php b/src/Endpoint/Provider/SugarEndpointProvider.php
index ddee4be..1ce7dd0 100644
--- a/src/Endpoint/Provider/SugarEndpointProvider.php
+++ b/src/Endpoint/Provider/SugarEndpointProvider.php
@@ -24,6 +24,7 @@
 use Sugarcrm\REST\Endpoint\Ping;
 use Sugarcrm\REST\Endpoint\Note;
 use Sugarcrm\REST\Endpoint\Generic;
+use Sugarcrm\REST\Endpoint\Rest;
 use Sugarcrm\REST\Endpoint\Smart;
 
 /**
@@ -161,5 +162,10 @@ class SugarEndpointProvider extends VersionedEndpointProvider
             self::ENDPOINT_CLASS => Integrate::class,
             self::ENDPOINT_PROPERTIES => [],
         ],
+        [
+            self::ENDPOINT_NAME => 'rest',
+            self::ENDPOINT_CLASS => Rest::class,
+            self::ENDPOINT_PROPERTIES => [],
+        ],
     ];
 }
diff --git a/src/Endpoint/Rest.php b/src/Endpoint/Rest.php
new file mode 100644
index 0000000..ccf10f3
--- /dev/null
+++ b/src/Endpoint/Rest.php
@@ -0,0 +1,74 @@
+<?php
+
+/**
+ * ©[2022] SugarCRM Inc.  Licensed by SugarCRM under the Apache 2.0 license.
+ */
+
+namespace Sugarcrm\REST\Endpoint;
+
+use GuzzleHttp\Psr7\Request;
+use Sugarcrm\REST\Endpoint\Abstracts\AbstractSugarEndpoint;
+
+/**
+ * Generic REST endpoint allowing for querying custom endpoints
+ * usage examples:
+ * $client->rest('custom/endpoint')->get();
+ * $client->rest('custom/endpoint')->post($data);
+ * $client->rest('custom/endpoint')->put($data);
+ * $client->rest('custom/endpoint')->delete();
+ * $client->rest('custom/endpoint')->patch($data);
+ * $client->rest('custom/endpoint')->withHeaders($headers)->get();
+ * $client->rest('Contacts')->setData(['fields' => 'id,first_name,last_name', 'max_num' => 1])->get();
+ * etc.
+ */
+class Rest extends Generic
+{
+    protected static array $_DEFAULT_PROPERTIES = [
+        self::PROPERTY_URL => '$endpoint',
+        self::PROPERTY_AUTH => true,
+        self::PROPERTY_HTTP_METHOD => "GET",
+    ];
+
+    public function get(mixed $data = null): static
+    {
+        $this->setProperty(self::PROPERTY_HTTP_METHOD, 'GET');
+        if (!is_null($data)) {
+            $this->setData($data);
+        }
+        return $this->execute();
+    }
+
+    public function post(mixed $data = null): static
+    {
+        $this->setProperty(self::PROPERTY_HTTP_METHOD, 'POST');
+        if (!is_null($data)) {
+            $this->setData($data);
+        }
+        return $this->execute();
+    }
+
+    public function put(mixed $data = null): static
+    {
+        $this->setProperty(self::PROPERTY_HTTP_METHOD, 'PUT');
+        if (!is_null($data)) {
+            $this->setData($data);
+        }
+        return $this->execute();
+    }
+
+    public function delete(): static
+    {
+        $this->setProperty(self::PROPERTY_HTTP_METHOD, 'DELETE');
+        return $this->execute();
+    }
+
+    public function patch(mixed $data = null): static
+    {
+        $this->setProperty(self::PROPERTY_HTTP_METHOD, 'PATCH');
+        if (!is_null($data)) {
+            $this->setData($data);
+        }
+        return $this->execute();
+    }
+
+}
diff --git a/src/Endpoint/Traits/CustomHeadersTrait.php b/src/Endpoint/Traits/CustomHeadersTrait.php
new file mode 100644
index 0000000..fac6a7c
--- /dev/null
+++ b/src/Endpoint/Traits/CustomHeadersTrait.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Sugarcrm\REST\Endpoint\Traits;
+
+use GuzzleHttp\Psr7\Request;
+
+trait CustomHeadersTrait
+{
+    protected array $customHeaders = [];
+
+    /**
+     * Set a custom header to be sent with the request
+     * @param string $name
+     * @param string $value
+     * @return $this
+     */
+    public function addCustomHeader(string $name, string $value): static
+    {
+        $normalized = strtolower($name);
+        $this->customHeaders[$normalized] = [$name, $value];
+        return $this;
+    }
+
+    /**
+     * Remove a custom header from the request
+     * @param string $name
+     * @return $this
+     */
+    public function removeCustomHeader(string $name): static
+    {
+        $normalized = strtolower($name);
+        if (isset($this->customHeaders[$normalized])) {
+            unset($this->customHeaders[$normalized]);
+        }
+        return $this;
+    }
+
+    protected function addCustomHeadersToRequest(Request $request): Request
+    {
+        if (!empty($this->customHeaders)) {
+            foreach ($this->customHeaders as $headerNormalized => $values) {
+                $request = $request->withHeader($values[0], $values[1]);
+            }
+        }
+        return $request;
+    }
+}
diff --git a/src/Exception/Filter/MissingFieldForDateExpression.php b/src/Exception/Filter/MissingFieldForFilterExpression.php
similarity index 65%
rename from src/Exception/Filter/MissingFieldForDateExpression.php
rename to src/Exception/Filter/MissingFieldForFilterExpression.php
index 13dc214..0422e4e 100644
--- a/src/Exception/Filter/MissingFieldForDateExpression.php
+++ b/src/Exception/Filter/MissingFieldForFilterExpression.php
@@ -11,7 +11,7 @@
 /**
  * @package Sugarcrm\REST\Exception\Filter
  */
-class MissingFieldForDateExpression extends EndpointException
+class MissingFieldForFilterExpression extends EndpointException
 {
-    protected $message = 'Field not configured on DateExpression';
+    protected $message = 'Field not configured on Filter Expression';
 }
diff --git a/tests/Endpoint/Data/Filters/AbstractOperatorTest.php b/tests/Endpoint/Data/Filters/AbstractOperatorTest.php
index 3beeb0e..bcb3363 100644
--- a/tests/Endpoint/Data/Filters/AbstractOperatorTest.php
+++ b/tests/Endpoint/Data/Filters/AbstractOperatorTest.php
@@ -57,8 +57,6 @@ protected function tearDown(): void
     public function testConstructor(): void
     {
         $Operator = new Contains();
-        $this->assertEmpty($Operator->getField());
-        $this->assertEmpty($Operator->getValue());
         $Operator = new Contains(['foo']);
         $this->assertEquals('foo', $Operator->getField());
         $this->assertEmpty($Operator->getValue());
diff --git a/tests/Endpoint/Data/Filters/DateExpressionTest.php b/tests/Endpoint/Data/Filters/DateExpressionTest.php
index 2f4782b..99b3bcd 100644
--- a/tests/Endpoint/Data/Filters/DateExpressionTest.php
+++ b/tests/Endpoint/Data/Filters/DateExpressionTest.php
@@ -8,7 +8,7 @@
 
 use PHPUnit\Framework\TestCase;
 use Sugarcrm\REST\Exception\Filter\UnknownFilterOperator;
-use Sugarcrm\REST\Exception\Filter\MissingFieldForDateExpression;
+use Sugarcrm\REST\Exception\Filter\MissingFieldForFilterExpression;
 use Sugarcrm\REST\Endpoint\Data\Filters\Expression\DateExpression;
 
 /**
@@ -54,7 +54,6 @@ public function testField(): void
 
         $this->assertEquals('test', $dateField->getValue($Date));
         $Date = new DateExpression();
-        $this->assertEmpty($dateField->getValue($Date));
         $this->assertEquals($Date, $Date->field('test'));
         $this->assertEquals('test', $dateField->getValue($Date));
     }
@@ -103,7 +102,6 @@ public function testCall(): void
 
     /**
      * @covers ::__call
-     * @expectedException Sugarcrm\REST\Exception\Filter\UnknownFilterOperator
      */
     public function testUnknownFilterOperatorException(): void
     {
@@ -116,13 +114,12 @@ public function testUnknownFilterOperatorException(): void
 
     /**
      * @covers::__call
-     * @expectedException Sugarcrm\REST\Exception\Filter\MissingFieldForDateExpression
      */
     public function testMissingFieldException(): void
     {
         $Expression = new DateExpression();
-        $this->expectException(MissingFieldForDateExpression::class);
-        $this->expectExceptionMessage("Field not configured on DateExpression");
+        $this->expectException(MissingFieldForFilterExpression::class);
+        $this->expectExceptionMessage("Field not configured on Filter Expression");
         $Expression->yesterday();
     }
 }
diff --git a/tests/Endpoint/Data/Filters/Expression/DistanceExpressionTest.php b/tests/Endpoint/Data/Filters/Expression/DistanceExpressionTest.php
new file mode 100644
index 0000000..f3f79c9
--- /dev/null
+++ b/tests/Endpoint/Data/Filters/Expression/DistanceExpressionTest.php
@@ -0,0 +1,113 @@
+<?php
+
+namespace Sugarcrm\REST\Tests\Endpoint\Data\Filters\Expression;
+
+use Sugarcrm\REST\Endpoint\Data\Filters\Expression\DistanceExpression;
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\InRadiusFromZip;
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\InRadiusFromCoords;
+use Sugarcrm\REST\Exception\Filter\MissingFieldForFilterExpression;
+use Sugarcrm\REST\Exception\Filter\UnknownFilterOperator;
+use PHPUnit\Framework\TestCase;
+
+class DistanceExpressionTest extends TestCase
+{
+    public function testRadiusFromZipWithAllArguments(): void
+    {
+        $expr = new DistanceExpression();
+        $expr->field('address')->radiusFromZip('90210', 'US', 25, 'mi');
+        $expected = [
+            'address' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => '90210',
+                    'countries' => 'US',
+                    'radius' => 25.0,
+                    'unitType' => 'mi',
+                ],
+            ],
+        ];
+        $expr->compile();
+        $this->assertEquals($expected, $expr->compile()[0]);
+    }
+
+    public function testRadiusFromZipWithDefaults(): void
+    {
+        $expr = new DistanceExpression();
+        $expr->field('address')->radiusFromZip('12345');
+        $expected = [
+            'address' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => '12345',
+                    'countries' => 'US',
+                    'radius' => 0.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $expr->compile()[0]);
+    }
+
+    public function testRadiusFromCoordsWithAllArguments(): void
+    {
+        $expr = new DistanceExpression();
+        $expr->field('geo')->radiusFromCoords(37.77, -122.41, 10, 'mi');
+        $expected = [
+            'geo' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 37.77,
+                    'longitude' => -122.41,
+                    'radius' => 10.0,
+                    'unitType' => 'mi',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $expr->compile()[0]);
+    }
+
+    public function testRadiusFromCoordsWithArrayCoordinates(): void
+    {
+        $expr = new DistanceExpression();
+        $expr->field('geo')->radiusFromCoords([51.5, -0.12], null, 15, 'km');
+        $expected = [
+            'geo' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 51.5,
+                    'longitude' => -0.12,
+                    'radius' => 15.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $expr->compile()[0]);
+    }
+
+    public function testRadiusFromCoordsWithDefaults(): void
+    {
+        $expr = new DistanceExpression();
+        $expr->field('geo')->radiusFromCoords(10.1, 20.2);
+        $expected = [
+            'geo' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 10.1,
+                    'longitude' => 20.2,
+                    'radius' => 0.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $expr->compile()[0]);
+    }
+
+    public function testMissingFieldThrowsException(): void
+    {
+        $this->expectException(MissingFieldForFilterExpression::class);
+        $expr = new DistanceExpression();
+        $expr->radiusFromZip('90210');
+    }
+
+    public function testUnknownOperatorThrowsException(): void
+    {
+        $this->expectException(UnknownFilterOperator::class);
+        $expr = new DistanceExpression();
+        $expr->field('address')->notARealOperator('foo');
+    }
+}
diff --git a/tests/Endpoint/Data/Filters/Operator/InRadiusFromCoordsTest.php b/tests/Endpoint/Data/Filters/Operator/InRadiusFromCoordsTest.php
new file mode 100644
index 0000000..bbb0c1c
--- /dev/null
+++ b/tests/Endpoint/Data/Filters/Operator/InRadiusFromCoordsTest.php
@@ -0,0 +1,145 @@
+<?php
+
+namespace Sugarcrm\REST\Tests\Endpoint\Data\Filters\Operator;
+
+use PHPUnit\Framework\TestCase;
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\InRadiusFromCoords;
+
+class InRadiusFromCoordsTest extends TestCase
+{
+    public function testBuildsProperFilterWithAllProperties(): void
+    {
+        $operator = new InRadiusFromCoords();
+        $operator->setField('location')
+            ->setLatitude(37.7749)
+            ->setLongitude(-122.4194)
+            ->setRadius(10.5)
+            ->setUnitType('mi');
+        $expected = [
+            'location' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 37.7749,
+                    'longitude' => -122.4194,
+                    'radius' => 10.5,
+                    'unitType' => 'mi',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+
+    public function testConstructorArgumentsAssociativeArray(): void
+    {
+        $args = [
+            'location',
+            [
+                'latitude' => 40.7128,
+                'longitude' => -74.0060,
+                'radius' => 5,
+                'unitType' => 'km',
+            ],
+        ];
+        $operator = new InRadiusFromCoords($args);
+        $expected = [
+            'location' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 40.7128,
+                    'longitude' => -74.0060,
+                    'radius' => 5.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->setField('location')->compile());
+    }
+
+    public function testConstructorArgumentsIndexedArray(): void
+    {
+        $args = ['geo', 12.34, 56.78, 25, 'mi'];
+        $operator = new InRadiusFromCoords($args);
+        $expected = [
+            'geo' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 12.34,
+                    'longitude' => 56.78,
+                    'radius' => 25.0,
+                    'unitType' => 'mi',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->setField('geo')->compile());
+    }
+
+    public function testSetValueWithIndexedArray(): void
+    {
+        $operator = new InRadiusFromCoords();
+        $operator->setField('geo')
+            ->setValue([51.5074, -0.1278, 15, 'km']);
+        $expected = [
+            'geo' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 51.5074,
+                    'longitude' => -0.1278,
+                    'radius' => 15.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+
+    public function testSetValueWithCoordinatesArrayAsFirstElement(): void
+    {
+        $operator = new InRadiusFromCoords();
+        $operator->setField('geo')
+            ->setValue([[33.33, 44.44], 100, 'km']);
+        $expected = [
+            'geo' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 33.33,
+                    'longitude' => 44.44,
+                    'radius' => 100.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+
+    public function testDefaultsWhenMissingValues(): void
+    {
+        $operator = new InRadiusFromCoords();
+        $operator->setField('geo')->setValue([]);
+        $expected = [
+            'geo' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 0.0,
+                    'longitude' => 0.0,
+                    'radius' => 0.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+
+    public function testSetCoordinatesWithAssociativeArray(): void
+    {
+        $operator = new InRadiusFromCoords();
+        $operator->setField('geo')->setCoordinates([
+            'latitude' => 10.1,
+            'longitude' => 20.2,
+        ])->setRadius(7)->setUnitType('mi');
+        $expected = [
+            'geo' => [
+                InRadiusFromCoords::OPERATOR => [
+                    'latitude' => 10.1,
+                    'longitude' => 20.2,
+                    'radius' => 7.0,
+                    'unitType' => 'mi',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+}
diff --git a/tests/Endpoint/Data/Filters/Operator/InRadiusFromZipTest.php b/tests/Endpoint/Data/Filters/Operator/InRadiusFromZipTest.php
new file mode 100644
index 0000000..8c95248
--- /dev/null
+++ b/tests/Endpoint/Data/Filters/Operator/InRadiusFromZipTest.php
@@ -0,0 +1,145 @@
+<?php
+
+namespace Sugarcrm\REST\Tests\Endpoint\Data\Filters\Operator;
+
+use Sugarcrm\REST\Endpoint\Data\Filters\Operator\InRadiusFromZip;
+use PHPUnit\Framework\TestCase;
+
+class InRadiusFromZipTest extends TestCase
+{
+    public function testBuildsProperFilterWithAllProperties(): void
+    {
+        $operator = new InRadiusFromZip();
+        $operator->setField('address')
+            ->setZipCode('90210')
+            ->setCountry('US')
+            ->setRadius(25)
+            ->setUnitType('mi');
+        $expected = [
+            'address' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => '90210',
+                    'countries' => 'US',
+                    'radius' => 25.0,
+                    'unitType' => 'mi',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+
+    public function testConstructorArgumentsIndexedArray(): void
+    {
+        $args = ['address', '12345', 'CA', 50, 'km'];
+        $operator = new InRadiusFromZip($args);
+        $expected = [
+            'address' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => '12345',
+                    'countries' => 'CA',
+                    'radius' => 50.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->setField('address')->compile());
+    }
+
+    public function testConstructorArgumentsAssociativeArray(): void
+    {
+        $args = [
+            'address',
+            [
+                'zipCode' => '54321',
+                'countries' => 'MX',
+                'radius' => 10,
+                'unitType' => 'mi',
+            ],
+        ];
+        $operator = new InRadiusFromZip($args);
+        $expected = [
+            'address' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => '54321',
+                    'countries' => 'MX',
+                    'radius' => 10.0,
+                    'unitType' => 'mi',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->setField('address')->compile());
+    }
+
+    public function testSetValueWithIndexedArray(): void
+    {
+        $operator = new InRadiusFromZip();
+        $operator->setField('loc')->setValue(['11111', 'US', 5, 'km']);
+        $expected = [
+            'loc' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => '11111',
+                    'countries' => 'US',
+                    'radius' => 5.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+
+    public function testSetValueWithAssociativeArray(): void
+    {
+        $operator = new InRadiusFromZip();
+        $operator->setField('loc')->setValue([
+            'zipCode' => '22222',
+            'countries' => 'CA',
+            'radius' => 15,
+            'unitType' => 'mi',
+        ]);
+        $expected = [
+            'loc' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => '22222',
+                    'countries' => 'CA',
+                    'radius' => 15.0,
+                    'unitType' => 'mi',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+
+    public function testSetValueWithScalarZipCode(): void
+    {
+        $operator = new InRadiusFromZip();
+        $operator->setField('loc')->setValue('33333');
+        $expected = [
+            'loc' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => '33333',
+                    'countries' => 'US', // default
+                    'radius' => 0.0, // default
+                    'unitType' => 'km', // default
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+
+    public function testDefaultsWhenMissingValues(): void
+    {
+        $operator = new InRadiusFromZip();
+        $operator->setField('loc')->setValue([]);
+        $expected = [
+            'loc' => [
+                InRadiusFromZip::OPERATOR => [
+                    'zipCode' => 0,
+                    'countries' => 'US',
+                    'radius' => 0.0,
+                    'unitType' => 'km',
+                ],
+            ],
+        ];
+        $this->assertEquals($expected, $operator->compile());
+    }
+}
diff --git a/tests/Endpoint/IntegrateTest.php b/tests/Endpoint/IntegrateTest.php
index 245b34e..8b032b4 100644
--- a/tests/Endpoint/IntegrateTest.php
+++ b/tests/Endpoint/IntegrateTest.php
@@ -99,6 +99,7 @@ public function testUpsert(): void
         $this->assertEquals('test', $endpoint->foobar_c);
         $this->assertEquals('Prospect', $endpoint['account_type']);
     }
+
     public function testUpsertWithSetField(): void
     {
         $this->client->mockResponses->append(new Response('201'), new Response('201'));
@@ -114,6 +115,7 @@ public function testUpsertWithSetField(): void
 
         $endpoint->setFields(['foobar', 'bar']);
         $endpoint->upsert();
+
         $request = $this->client->mockResponses->getLastRequest();
         $body = json_decode($request->getBody()->getContents(), true);
         $this->assertArrayHasKey('fields', $body);
diff --git a/tests/Endpoint/RestTest.php b/tests/Endpoint/RestTest.php
new file mode 100644
index 0000000..4dac673
--- /dev/null
+++ b/tests/Endpoint/RestTest.php
@@ -0,0 +1,125 @@
+<?php
+
+namespace Sugarcrm\REST\Tests\Endpoint;
+
+use PHPUnit\Framework\TestCase;
+use GuzzleHttp\Psr7\Response;
+use GuzzleHttp\Psr7\Request;
+use Sugarcrm\REST\Endpoint\Rest;
+use Sugarcrm\REST\Tests\Stubs\Client\Client;
+
+class RestTest extends TestCase
+{
+    protected Client $client;
+
+    protected function setUp(): void
+    {
+        $this->client = new Client();
+        parent::setUp();
+    }
+
+    public function testGetRequestToCustomEndpoint()
+    {
+        $this->client->mockResponses->append(new Response(200, [], 'OK'));
+        $rest = $this->client->rest('custom/endpoint');
+        $rest->setBaseUrl('http://localhost/rest/v11');
+        $rest->get(['foo' => 'bar']);
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('GET', $request->getMethod());
+        $this->assertEquals('http://localhost/rest/v11/custom/endpoint?foo=bar', (string) $request->getUri());
+        $this->assertStringContainsString('foo=bar', (string) $request->getUri()->getQuery());
+    }
+
+    public function testPostRequestWithData()
+    {
+        $this->client->mockResponses->append(new Response(200, [], 'OK'));
+        $rest = new Rest([], ['custom/endpoint']);
+        $rest->setClient($this->client);
+        $rest->setBaseUrl('http://localhost/rest/v11');
+        $data = ['foo' => 'bar', 'baz' => 'qux'];
+        $rest->post($data);
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('POST', $request->getMethod());
+        $this->assertEquals('http://localhost/rest/v11/custom/endpoint', (string) $request->getUri());
+        $body = json_decode($request->getBody()->getContents(), true);
+        $this->assertEquals($data, $body);
+    }
+
+    public function testPutRequestWithData()
+    {
+        $this->client->mockResponses->append(new Response(200, [], 'OK'));
+        $rest = new Rest([], ['custom/endpoint']);
+        $rest->setClient($this->client);
+        $rest->setBaseUrl('http://localhost/rest/v11');
+        $data = ['foo' => 'bar'];
+        $rest->put($data);
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('PUT', $request->getMethod());
+        $body = json_decode($request->getBody()->getContents(), true);
+        $this->assertEquals($data, $body);
+    }
+
+    public function testPatchRequestWithData()
+    {
+        $this->client->mockResponses->append(new Response(200, [], 'OK'));
+        $rest = new Rest([], ['custom/endpoint']);
+        $rest->setClient($this->client);
+        $rest->setBaseUrl('http://localhost/rest/v11');
+        $data = ['foo' => 'bar'];
+        $rest->patch($data);
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('PATCH', $request->getMethod());
+        $body = json_decode($request->getBody()->getContents(), true);
+        $this->assertEquals($data, $body);
+    }
+
+    public function testDeleteRequest()
+    {
+        $this->client->mockResponses->append(new Response(200, [], 'OK'));
+        $rest = $this->client->rest('custom/endpoint');
+        $rest->setBaseUrl('http://localhost/rest/v11');
+        $rest->delete();
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('DELETE', $request->getMethod());
+        $this->assertEquals('http://localhost/rest/v11/custom/endpoint', (string) $request->getUri());
+    }
+
+    public function testAddCustomHeader()
+    {
+        $this->client->mockResponses->append(new Response(200, [], 'OK'));
+        $rest = $this->client->rest('custom/endpoint');
+        $rest->setBaseUrl('http://localhost/rest/v11');
+        $rest->addCustomHeader('X-Test-Header', 'value1');
+        $rest->get();
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertTrue($request->hasHeader('X-Test-Header'));
+        $this->assertEquals(['value1'], $request->getHeader('X-Test-Header'));
+    }
+
+    public function testRemoveCustomHeader()
+    {
+        $this->client->mockResponses->append(new Response(200, [], 'OK'));
+        $rest = $this->client->rest('custom/endpoint');
+        $rest->setBaseUrl('http://localhost/rest/v11');
+        $rest->addCustomHeader('X-Test-Header', 'value1');
+        $rest->removeCustomHeader('X-Test-Header');
+        $rest->get();
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertFalse($request->hasHeader('X-Test-Header'));
+    }
+
+    public function testMultipleCustomHeaders()
+    {
+        $this->client->mockResponses->append(new Response(200, [], 'OK'));
+        $rest = $this->client->rest('custom/endpoint');
+        $rest->setBaseUrl('http://localhost/rest/v11');
+        $rest->addCustomHeader('X-Test-Header', 'value1');
+        $rest->addCustomHeader('Another-Header', 'value2');
+        $rest->get();
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertTrue($request->hasHeader('X-Test-Header'));
+        $this->assertEquals(['value1'], $request->getHeader('X-Test-Header'));
+        $this->assertTrue($request->hasHeader('Another-Header'));
+        $this->assertEquals(['value2'], $request->getHeader('Another-Header'));
+    }
+}