fix: Refactor Client and update handler methods.

Reordered constructor parameters for clarity and consistency. Added dedicated handler methods for Accounting, Domain, and RootServer with lazy instantiation. Updated README to reflect method naming changes.

Author: efebagri

README.md

@@ -55,6 +55,6 @@ $token = getenv('24FIRE_API_KEY');
 $client = new FireAPI($token, true); // 'true' activates the sandbox environment
 
 // Request to the server in the sandbox environment
-var_dump($client->RootServer()->getAll());
+var_dump($client->rootServer()->getAll());
 ?>
 ```

src/Client.php

@@ -2,7 +2,10 @@
 
 namespace FireAPI;
 
+use FireAPI\Accounting\Accounting;
+use FireAPI\Domain\Domain;
 use FireAPI\Exceptions\ParameterException;
+use FireAPI\RootServer\RootServer;
 use GuzzleHttp\Exception\GuzzleException;
 use Psr\Http\Message\ResponseInterface;
 use RuntimeException;
@@ -20,7 +23,7 @@ class Client
      * @param \GuzzleHttp\Client|null $httpClient
      * @param bool $sandbox
      */
-    public function __construct(string $token, ?\GuzzleHttp\Client $httpClient = null, bool $sandbox = false)
+    public function __construct(string $token, bool $sandbox = false, ?\GuzzleHttp\Client $httpClient = null)
     {
         $this->token = $token;
         $this->setHttpClient($httpClient);
@@ -172,4 +175,36 @@ public function delete(string $actionPath, array $params = []): mixed
         $response = $this->request($actionPath, $params, 'DELETE');
         return $this->processRequest($response);
     }
+
+    /**
+     * Retrieve the accounting handler instance.
+     *
+     * If the accounting handler does not already exist, it initializes a new instance.
+     *
+     * @return Accounting
+     */
+    public function accounting(): Accounting
+    {
+        return $this->accountingHandler ??= new Accounting($this);
+    }
+
+    /**
+     * Retrieve the domain handler instance.
+     *
+     * @return Domain
+     */
+    public function domain(): Domain
+    {
+        return $this->domainHandler ??= new Domain($this);
+    }
+
+    /**
+     * Retrieves the RootServer instance. If the instance does not already exist, it initializes a new RootServer object.
+     *
+     * @return RootServer The instance of the RootServer.
+     */
+    public function rootServer(): RootServer
+    {
+        return $this->rootServerHandler ??= new RootServer($this);
+    }
 }