diff --git a/Gateway/Request/InstallmentOptionsDataBuilder.php b/Gateway/Request/InstallmentOptionsDataBuilder.php
new file mode 100644
index 000000000..82891589b
--- /dev/null
+++ b/Gateway/Request/InstallmentOptionsDataBuilder.php
@@ -0,0 +1,160 @@
+<?php
+
+namespace Adyen\Payment\Gateway\Request;
+
+use Adyen\Payment\Helper\Config;
+use Adyen\Payment\Helper\Data as AdyenDataHelper;
+use Magento\Framework\Serialize\SerializerInterface;
+use Magento\Payment\Gateway\Data\PaymentDataObject;
+use Magento\Payment\Gateway\Helper\SubjectReader;
+use Magento\Payment\Gateway\Request\BuilderInterface;
+use Magento\Store\Model\StoreManagerInterface;
+
+class InstallmentOptionsDataBuilder implements BuilderInterface
+{
+    public function __construct(
+        private readonly Config $configHelper,
+        private readonly SerializerInterface $serializer,
+        private readonly StoreManagerInterface $storeManager,
+        private readonly AdyenDataHelper $adyenHelper
+    ) {
+    }
+
+    public function build(array $buildSubject): array
+    {
+        /** @var PaymentDataObject $paymentDataObject */
+        $paymentDataObject = SubjectReader::readPayment($buildSubject);
+        $orderAmount = $paymentDataObject->getOrder()->getGrandTotalAmount();
+
+        $storeId = $this->storeManager->getStore()->getId();
+
+        if (!$this->configHelper->getAdyenCcConfigData('enable_installments', $storeId)) {
+            return [];
+        }
+
+        $raw = $this->configHelper->getAdyenCcConfigData('installments', $storeId);
+        if (empty($raw)) {
+            return [];
+        }
+
+        $installmentsConfig = $this->serializer->unserialize($raw);
+
+        $installmentOptions = $this->formatInstallmentOptions($installmentsConfig, $orderAmount);
+
+        return empty($installmentOptions)
+            ? []
+            : ['body' => ['installmentOptions' => $installmentOptions]];
+    }
+
+    private function formatInstallmentOptions(array $config, float $orderAmount): array
+    {
+        $brandMap = $this->getBrandMapFromXml();
+        $result = [];
+
+        foreach ($config as $brandCode => $rules) {
+            $pm = $brandMap[$brandCode] ?? null;
+            if (!$pm || !is_array($rules)) {
+                continue;
+            }
+
+            $thresholds = $this->parseThresholds($rules);
+            if (!$thresholds) {
+                continue;
+            }
+
+            $values = $this->collectEligibleValues($thresholds, $orderAmount);
+
+            $values[] = 1;
+
+            $values = array_values(array_unique(array_filter($values, static fn($v) => $v > 0)));
+            sort($values, SORT_NUMERIC);
+
+            if ($values) {
+                $result[$pm] = ['values' => $values];
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Converts config rules into a sorted map: [minAmount(float) => values(int[])]
+     * Accepts common shapes:
+     * - [minAmount => [2,3]]
+     * - [minAmount => ['values' => [2,3]]]
+     * - [minAmount => 3]
+     */
+    private function parseThresholds(array $rules): array
+    {
+        $thresholds = [];
+
+        foreach ($rules as $minAmount => $installments) {
+            $values = $this->normalizeInstallmentValues($installments);
+            if (!$values) {
+                continue;
+            }
+
+            $thresholds[(float)$minAmount] = $values;
+        }
+
+        if (!$thresholds) {
+            return [];
+        }
+
+        ksort($thresholds, SORT_NUMERIC);
+        return $thresholds;
+    }
+
+    private function collectEligibleValues(array $thresholds, float $orderAmount): array
+    {
+        $values = [];
+
+        foreach ($thresholds as $minAmount => $tierValues) {
+            if ($orderAmount < (float)$minAmount) {
+                break;
+            }
+            // Append values from each eligible tier
+            $values = array_merge($values, $tierValues);
+        }
+
+        return $values;
+    }
+
+    private function normalizeInstallmentValues(mixed $installments): array
+    {
+        // If admin config stores something like ['values' => [2,3]]
+        if (is_array($installments) && isset($installments['values']) && is_array($installments['values'])) {
+            $installments = $installments['values'];
+        }
+
+        if (is_numeric($installments)) {
+            return [(int)$installments];
+        }
+
+        if (is_array($installments)) {
+            $out = [];
+            foreach ($installments as $v) {
+                if (is_numeric($v)) {
+                    $out[] = (int)$v;
+                }
+            }
+            return $out;
+        }
+
+        return [];
+    }
+
+    private function getBrandMapFromXml(): array
+    {
+        $altData = $this->adyenHelper->getCcTypesAltData();
+
+        $map = [];
+        foreach ($altData as $altCode => $data) {
+            if (!empty($data['code'])) {
+                $map[$data['code']] = $altCode;
+            }
+        }
+
+        return $map;
+    }
+}
diff --git a/Test/Unit/Gateway/Request/InstallmentOptionsDataBuilderTest.php b/Test/Unit/Gateway/Request/InstallmentOptionsDataBuilderTest.php
new file mode 100644
index 000000000..d6924b887
--- /dev/null
+++ b/Test/Unit/Gateway/Request/InstallmentOptionsDataBuilderTest.php
@@ -0,0 +1,266 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Adyen\Payment\Test\Unit\Gateway\Request;
+
+use Adyen\Payment\Gateway\Request\InstallmentOptionsDataBuilder;
+use Adyen\Payment\Helper\Config;
+use Adyen\Payment\Helper\Data as AdyenDataHelper;
+use Adyen\Payment\Test\Unit\AbstractAdyenTestCase;
+use Magento\Framework\Serialize\SerializerInterface;
+use Magento\Payment\Gateway\Data\OrderAdapterInterface;
+use Magento\Payment\Gateway\Data\PaymentDataObject;
+use Magento\Store\Api\Data\StoreInterface;
+use Magento\Store\Model\StoreManagerInterface;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class InstallmentOptionsDataBuilderTest extends AbstractAdyenTestCase
+{
+    private Config&MockObject $configHelper;
+    private SerializerInterface&MockObject $serializer;
+    private StoreManagerInterface&MockObject $storeManager;
+    private AdyenDataHelper&MockObject $adyenHelper;
+
+    private StoreInterface&MockObject $store;
+    private PaymentDataObject&MockObject $paymentDataObject;
+    private OrderAdapterInterface&MockObject $order;
+
+    private InstallmentOptionsDataBuilder $subject;
+
+    protected function setUp(): void
+    {
+        $this->configHelper = $this->createMock(Config::class);
+        $this->serializer = $this->createMock(SerializerInterface::class);
+        $this->storeManager = $this->createMock(StoreManagerInterface::class);
+        $this->adyenHelper = $this->createMock(AdyenDataHelper::class);
+
+        $this->store = $this->createMock(StoreInterface::class);
+        $this->paymentDataObject = $this->createMock(PaymentDataObject::class);
+        $this->order = $this->createMock(OrderAdapterInterface::class);
+
+        $this->storeManager->method('getStore')->willReturn($this->store);
+        $this->store->method('getId')->willReturn(1);
+
+        $this->paymentDataObject->method('getOrder')->willReturn($this->order);
+
+        $this->subject = new InstallmentOptionsDataBuilder(
+            $this->configHelper,
+            $this->serializer,
+            $this->storeManager,
+            $this->adyenHelper
+        );
+    }
+
+    public function testBuildReturnsEmptyArrayWhenInstallmentsDisabled(): void
+    {
+        $this->order->method('getGrandTotalAmount')->willReturn(100.0);
+
+        $this->configHelper
+            ->expects($this->once())
+            ->method('getAdyenCcConfigData')
+            ->with('enable_installments', 1)
+            ->willReturn(false);
+
+        $result = $this->subject->build([
+            'payment' => $this->paymentDataObject
+        ]);
+
+        $this->assertSame([], $result);
+    }
+
+    public function testBuildReturnsEmptyArrayWhenInstallmentsConfigIsEmpty(): void
+    {
+        $this->order->method('getGrandTotalAmount')->willReturn(100.0);
+
+        $this->configHelper
+            ->method('getAdyenCcConfigData')
+            ->willReturnMap([
+                ['enable_installments', 1, true],
+                ['installments', 1, ''], // empty raw
+            ]);
+
+        $result = $this->subject->build([
+            'payment' => $this->paymentDataObject
+        ]);
+
+        $this->assertSame([], $result);
+    }
+
+    public function testBuildReturnsInstallmentOptionsForEligibleTiersAndAddsOne(): void
+    {
+        $this->order->method('getGrandTotalAmount')->willReturn(65.0);
+
+        $this->configHelper
+            ->method('getAdyenCcConfigData')
+            ->willReturnMap([
+                ['enable_installments', 1, true],
+                ['installments', 1, 'serialized-config'],
+            ]);
+
+        $this->adyenHelper
+            ->method('getCcTypesAltData')
+            ->willReturn([
+                'visa' => ['code' => 'visa'],
+                'mc'   => ['code' => 'mc'],
+            ]);
+
+        $this->serializer
+            ->expects($this->once())
+            ->method('unserialize')
+            ->with('serialized-config')
+            ->willReturn([
+                // Eligible tiers for 65: >=20 and >=60, not >=100
+                'visa' => [
+                    20  => [2],
+                    60  => [1],
+                    100 => [3],
+                ],
+            ]);
+
+        $result = $this->subject->build([
+            'payment' => $this->paymentDataObject
+        ]);
+
+        $this->assertSame(
+            [
+                'body' => [
+                    'installmentOptions' => [
+                        'visa' => [
+                            'values' => [1, 2],
+                        ],
+                    ],
+                ],
+            ],
+            $result
+        );
+    }
+
+    public function testBuildSkipsUnknownBrandAndNonArrayRules(): void
+    {
+        $this->order->method('getGrandTotalAmount')->willReturn(200.0);
+
+        $this->configHelper
+            ->method('getAdyenCcConfigData')
+            ->willReturnMap([
+                ['enable_installments', 1, true],
+                ['installments', 1, 'raw'],
+            ]);
+
+        $this->adyenHelper
+            ->method('getCcTypesAltData')
+            ->willReturn([
+                'visa' => ['code' => 'visa'],
+            ]);
+
+        $this->serializer
+            ->method('unserialize')
+            ->willReturn([
+                'unknown_brand' => [20 => [2, 3]],
+                'visa' => 'not-an-array',
+            ]);
+
+        $result = $this->subject->build([
+            'payment' => $this->paymentDataObject
+        ]);
+
+        $this->assertSame([], $result);
+    }
+
+    public function testBuildSupportsVariousInstallmentValueShapes(): void
+    {
+        $this->order->method('getGrandTotalAmount')->willReturn(250.0);
+
+        $this->configHelper
+            ->method('getAdyenCcConfigData')
+            ->willReturnMap([
+                ['enable_installments', 1, true],
+                ['installments', 1, 'raw'],
+            ]);
+
+        $this->adyenHelper
+            ->method('getCcTypesAltData')
+            ->willReturn([
+                'mc' => ['code' => 'mc'],
+            ]);
+
+        $this->serializer
+            ->method('unserialize')
+            ->willReturn([
+                'mc' => [
+                    // scalar
+                    20 => 3,
+                    // array with numeric + non-numeric
+                    60 => [2, 'x', 4],
+                    // nested "values" shape
+                    100 => ['values' => [6, 8]],
+                    // empty should be ignored
+                    120 => [],
+                ],
+            ]);
+
+        $result = $this->subject->build([
+            'payment' => $this->paymentDataObject
+        ]);
+
+        $this->assertSame(
+            [
+                'body' => [
+                    'installmentOptions' => [
+                        'mc' => [
+                            // eligible tiers are all (orderAmount=250)
+                            // values merged: [3] + [2,4] + [6,8] + 1, sorted unique
+                            'values' => [1, 2, 3, 4, 6, 8],
+                        ],
+                    ],
+                ],
+            ],
+            $result
+        );
+    }
+
+    public function testBuildBreaksEarlyWhenOrderAmountBelowFirstThresholdAndReturnsOnlyOne(): void
+    {
+        // orderAmount is below the first minAmount (20)
+        $this->order->method('getGrandTotalAmount')->willReturn(10.0);
+
+        $this->configHelper
+            ->method('getAdyenCcConfigData')
+            ->willReturnMap([
+                ['enable_installments', 1, true],
+                ['installments', 1, 'raw'],
+            ]);
+
+        $this->adyenHelper
+            ->method('getCcTypesAltData')
+            ->willReturn([
+                'visa' => ['code' => 'visa'],
+            ]);
+
+        $this->serializer
+            ->method('unserialize')
+            ->willReturn([
+                'visa' => [
+                    20 => [2, 3],
+                    60 => [1],
+                ],
+            ]);
+
+        $result = $this->subject->build([
+            'payment' => $this->paymentDataObject
+        ]);
+
+        $this->assertSame(
+            [
+                'body' => [
+                    'installmentOptions' => [
+                        'visa' => [
+                            'values' => [1],
+                        ],
+                    ],
+                ],
+            ],
+            $result
+        );
+    }
+}
diff --git a/etc/di.xml b/etc/di.xml
index 2abaab82c..7104cc4ed 100755
--- a/etc/di.xml
+++ b/etc/di.xml
@@ -1147,6 +1147,7 @@
                 <item name="payment" xsi:type="string">Adyen\Payment\Gateway\Request\PaymentDataBuilder</item>
                 <item name="description" xsi:type="string">Adyen\Payment\Gateway\Request\DescriptionDataBuilder</item>
                 <item name="transaction" xsi:type="string">Adyen\Payment\Gateway\Request\CheckoutDataBuilder</item>
+                <item name="installmentOptions" xsi:type="string">Adyen\Payment\Gateway\Request\InstallmentOptionsDataBuilder</item>
                 <item name="header" xsi:type="string">Adyen\Payment\Gateway\Request\Header\HeaderDataBuilder</item>
                 <item name="company" xsi:type="string">Adyen\Payment\Gateway\Request\CompanyDataBuilder</item>
                 <item name="line_items" xsi:type="string">Adyen\Payment\Gateway\Request\LineItemsDataBuilder</item>
@@ -1539,6 +1540,11 @@
             <argument name="serializer" xsi:type="object">Magento\Framework\Serialize\Serializer\Serialize</argument>
         </arguments>
     </type>
+    <type name="Adyen\Payment\Gateway\Request\InstallmentOptionsDataBuilder">
+        <arguments>
+            <argument name="serializer" xsi:type="object">Magento\Framework\Serialize\Serializer\Serialize</argument>
+        </arguments>
+    </type>
     <type name="Adyen\Payment\Model\Config\Backend\InstallmentsPosCloud">
         <arguments>
             <argument name="serializer" xsi:type="object">Magento\Framework\Serialize\Serializer\Serialize</argument>