diff --git a/lib/EasyPost/EasyPostClient.php b/lib/EasyPost/EasyPostClient.php
index f0d8db68..e5d14889 100644
--- a/lib/EasyPost/EasyPostClient.php
+++ b/lib/EasyPost/EasyPostClient.php
@@ -22,6 +22,7 @@
 use EasyPost\Service\EmbeddableService;
 use EasyPost\Service\EndShipperService;
 use EasyPost\Service\EventService;
+use EasyPost\Service\FedExRegistrationService;
 use EasyPost\Service\InsuranceService;
 use EasyPost\Service\LumaService;
 use EasyPost\Service\OrderService;
@@ -58,6 +59,7 @@
  * @property EmbeddableService $embeddable
  * @property EndShipperService $endShipper
  * @property EventService $event
+ * @property FedExRegistrationService $fedexRegistration
  * @property InsuranceService $insurance
  * @property LumaService $luma
  * @property OrderService $order
@@ -134,6 +136,7 @@ public function __get(string $serviceName)
             'embeddable' => EmbeddableService::class,
             'endShipper' => EndShipperService::class,
             'event' => EventService::class,
+            'fedexRegistration' => FedExRegistrationService::class,
             'insurance' => InsuranceService::class,
             'luma' => LumaService::class,
             'order' => OrderService::class,
diff --git a/lib/EasyPost/Service/FedExRegistrationService.php b/lib/EasyPost/Service/FedExRegistrationService.php
new file mode 100644
index 00000000..dd0f29be
--- /dev/null
+++ b/lib/EasyPost/Service/FedExRegistrationService.php
@@ -0,0 +1,172 @@
+<?php
+
+namespace EasyPost\Service;
+
+use EasyPost\Http\Requestor;
+use EasyPost\Util\InternalUtil;
+
+/**
+ * FedExRegistration service containing all the logic to make API calls.
+ */
+class FedExRegistrationService extends BaseService
+{
+    /**
+     * Register the billing address for a FedEx account.
+     * Advanced method for custom parameter structures.
+     *
+     * @param string $fedexAccountNumber
+     * @param mixed $params
+     * @return mixed
+     */
+    public function registerAddress(string $fedexAccountNumber, mixed $params = null): mixed
+    {
+        $wrappedParams = $this->wrapAddressValidation($params);
+        $url = "/fedex_registrations/{$fedexAccountNumber}/address";
+
+        $response = Requestor::request($this->client, 'post', $url, $wrappedParams);
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response);
+    }
+
+    /**
+     * Request a PIN for FedEx account verification.
+     *
+     * @param string $fedexAccountNumber
+     * @param string $pinMethodOption
+     * @return mixed
+     */
+    public function requestPin(string $fedexAccountNumber, string $pinMethodOption): mixed
+    {
+        $wrappedParams = [
+            'pin_method' => [
+                'option' => $pinMethodOption,
+            ],
+        ];
+        $url = "/fedex_registrations/{$fedexAccountNumber}/pin";
+
+        $response = Requestor::request($this->client, 'post', $url, $wrappedParams);
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response);
+    }
+
+    /**
+     * Validate the PIN entered by the user for FedEx account verification.
+     *
+     * @param string $fedexAccountNumber
+     * @param mixed $params
+     * @return mixed
+     */
+    public function validatePin(string $fedexAccountNumber, mixed $params = null): mixed
+    {
+        $wrappedParams = $this->wrapPinValidation($params);
+        $url = "/fedex_registrations/{$fedexAccountNumber}/pin/validate";
+
+        $response = Requestor::request($this->client, 'post', $url, $wrappedParams);
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response);
+    }
+
+    /**
+     * Submit invoice information to complete FedEx account registration.
+     *
+     * @param string $fedexAccountNumber
+     * @param mixed $params
+     * @return mixed
+     */
+    public function submitInvoice(string $fedexAccountNumber, mixed $params = null): mixed
+    {
+        $wrappedParams = $this->wrapInvoiceValidation($params);
+        $url = "/fedex_registrations/{$fedexAccountNumber}/invoice";
+
+        $response = Requestor::request($this->client, 'post', $url, $wrappedParams);
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response);
+    }
+
+    /**
+     * Wraps address validation parameters and ensures the "name" field exists.
+     * If not present, generates a UUID (with hyphens removed) as the name.
+     *
+     * @param mixed $params
+     * @return array<string, mixed>
+     */
+    private function wrapAddressValidation(mixed $params): array
+    {
+        $wrappedParams = [];
+
+        if (isset($params['address_validation'])) {
+            $addressValidation = $params['address_validation'];
+            $this->ensureNameField($addressValidation);
+            $wrappedParams['address_validation'] = $addressValidation;
+        }
+
+        if (isset($params['easypost_details'])) {
+            $wrappedParams['easypost_details'] = $params['easypost_details'];
+        }
+
+        return $wrappedParams;
+    }
+
+    /**
+     * Wraps PIN validation parameters and ensures the "name" field exists.
+     * If not present, generates a UUID (with hyphens removed) as the name.
+     *
+     * @param mixed $params
+     * @return array<string, mixed>
+     */
+    private function wrapPinValidation(mixed $params): array
+    {
+        $wrappedParams = [];
+
+        if (isset($params['pin_validation'])) {
+            $pinValidation = $params['pin_validation'];
+            $this->ensureNameField($pinValidation);
+            $wrappedParams['pin_validation'] = $pinValidation;
+        }
+
+        if (isset($params['easypost_details'])) {
+            $wrappedParams['easypost_details'] = $params['easypost_details'];
+        }
+
+        return $wrappedParams;
+    }
+
+    /**
+     * Wraps invoice validation parameters and ensures the "name" field exists.
+     * If not present, generates a UUID (with hyphens removed) as the name.
+     *
+     * @param mixed $params
+     * @return array<string, mixed>
+     */
+    private function wrapInvoiceValidation(mixed $params): array
+    {
+        $wrappedParams = [];
+
+        if (isset($params['invoice_validation'])) {
+            $invoiceValidation = $params['invoice_validation'];
+            $this->ensureNameField($invoiceValidation);
+            $wrappedParams['invoice_validation'] = $invoiceValidation;
+        }
+
+        if (isset($params['easypost_details'])) {
+            $wrappedParams['easypost_details'] = $params['easypost_details'];
+        }
+
+        return $wrappedParams;
+    }
+
+    /**
+     * Ensures the "name" field exists in the provided array.
+     * If not present, generates a unique ID as the name.
+     * This follows the pattern used in the web UI implementation.
+     *
+     * @param array<string, mixed> &$array
+     * @return void
+     */
+    private function ensureNameField(array &$array): void
+    {
+        if (!isset($array['name'])) {
+            $array['name'] = uniqid();
+        }
+    }
+}
diff --git a/test/EasyPost/FedExRegistrationTest.php b/test/EasyPost/FedExRegistrationTest.php
new file mode 100644
index 00000000..afbbda6d
--- /dev/null
+++ b/test/EasyPost/FedExRegistrationTest.php
@@ -0,0 +1,176 @@
+<?php
+
+namespace EasyPost\Test;
+
+use EasyPost\Constant\Constants;
+use EasyPost\EasyPostClient;
+use EasyPost\EasyPostObject;
+use EasyPost\Test\Mocking\MockingUtility;
+use EasyPost\Test\Mocking\MockRequest;
+use EasyPost\Test\Mocking\MockRequestMatchRule;
+use EasyPost\Test\Mocking\MockRequestResponseInfo;
+use PHPUnit\Framework\TestCase;
+
+class FedExRegistrationTest extends TestCase
+{
+    private static EasyPostClient $client;
+
+    /**
+     * Setup the testing environment for this file.
+     */
+    public static function setUpBeforeClass(): void
+    {
+        $mockingUtility = new MockingUtility(
+            [
+                new MockRequest(
+                    new MockRequestMatchRule(
+                        'post',
+                        '/v2\/fedex_registrations\/\S*\/address$/'
+                    ),
+                    new MockRequestResponseInfo(
+                        200,
+                        '{"email_address":null,"options":["SMS","CALL","INVOICE"],"phone_number":"***-***-9721"}'
+                    )
+                ),
+                new MockRequest(
+                    new MockRequestMatchRule(
+                        'post',
+                        '/v2\/fedex_registrations\/\S*\/pin$/'
+                    ),
+                    new MockRequestResponseInfo(
+                        200,
+                        '{"message":"sent secured Pin"}'
+                    )
+                ),
+                new MockRequest(
+                    new MockRequestMatchRule(
+                        'post',
+                        '/v2\/fedex_registrations\/\S*\/pin\/validate$/'
+                    ),
+                    new MockRequestResponseInfo(
+                        200,
+                        '{"id":"ca_123","type":"FedexAccount",' .
+                        '"credentials":{"account_number":"123456789","mfa_key":"123456789-XXXXX"}}'
+                    )
+                ),
+                new MockRequest(
+                    new MockRequestMatchRule(
+                        'post',
+                        '/v2\/fedex_registrations\/\S*\/invoice$/'
+                    ),
+                    new MockRequestResponseInfo(
+                        200,
+                        '{"id":"ca_123","type":"FedexAccount",' .
+                        '"credentials":{"account_number":"123456789","mfa_key":"123456789-XXXXX"}}'
+                    )
+                ),
+            ]
+        );
+
+        self::$client = new EasyPostClient(
+            (string)getenv('EASYPOST_TEST_API_KEY'),
+            Constants::TIMEOUT,
+            Constants::API_BASE,
+            $mockingUtility
+        );
+    }
+
+    /**
+     * Test registering a billing address.
+     */
+    public function testRegisterAddress(): void
+    {
+        $fedexAccountNumber = '123456789';
+        $params = [
+            'address_validation' => [
+                'name' => 'BILLING NAME',
+                'street1' => '1234 BILLING STREET',
+                'city' => 'BILLINGCITY',
+                'state' => 'ST',
+                'postal_code' => '12345',
+                'country_code' => 'US',
+            ],
+            'easypost_details' => [
+                'carrier_account_id' => 'ca_123',
+            ],
+        ];
+
+        $response = self::$client->fedexRegistration->registerAddress($fedexAccountNumber, $params);
+
+        $this->assertInstanceOf(EasyPostObject::class, $response);
+        $this->assertNull($response->email_address); // @phpstan-ignore-line
+        $this->assertNotNull($response->options); // @phpstan-ignore-line
+        $this->assertContains('SMS', $response->options);
+        $this->assertContains('CALL', $response->options);
+        $this->assertContains('INVOICE', $response->options);
+        $this->assertEquals('***-***-9721', $response->phone_number); // @phpstan-ignore-line
+    }
+
+    /**
+     * Test requesting a pin.
+     */
+    public function testRequestPin(): void
+    {
+        $fedexAccountNumber = '123456789';
+
+        $response = self::$client->fedexRegistration->requestPin($fedexAccountNumber, 'SMS');
+
+        $this->assertInstanceOf(EasyPostObject::class, $response);
+        $this->assertEquals('sent secured Pin', $response->message); // @phpstan-ignore-line
+    }
+
+    /**
+     * Test validating a pin.
+     */
+    public function testValidatePin(): void
+    {
+        $fedexAccountNumber = '123456789';
+        $params = [
+            'pin_validation' => [
+                'pin_code' => '123456',
+                'name' => 'BILLING NAME',
+            ],
+            'easypost_details' => [
+                'carrier_account_id' => 'ca_123',
+            ],
+        ];
+
+        $response = self::$client->fedexRegistration->validatePin($fedexAccountNumber, $params);
+
+        $this->assertInstanceOf(EasyPostObject::class, $response);
+        $this->assertEquals('ca_123', $response->id); // @phpstan-ignore-line
+        $this->assertEquals('FedexAccount', $response->type); // @phpstan-ignore-line
+        $this->assertNotNull($response->credentials); // @phpstan-ignore-line
+        $this->assertEquals('123456789', $response->credentials['account_number']);
+        $this->assertEquals('123456789-XXXXX', $response->credentials['mfa_key']);
+    }
+
+    /**
+     * Test submitting details about an invoice.
+     */
+    public function testSubmitInvoice(): void
+    {
+        $fedexAccountNumber = '123456789';
+        $params = [
+            'invoice_validation' => [
+                'name' => 'BILLING NAME',
+                'invoice_number' => 'INV-12345',
+                'invoice_date' => '2025-12-08',
+                'invoice_amount' => '100.00',
+                'invoice_currency' => 'USD',
+            ],
+            'easypost_details' => [
+                'carrier_account_id' => 'ca_123',
+            ],
+        ];
+
+        $response = self::$client->fedexRegistration->submitInvoice($fedexAccountNumber, $params);
+
+        $this->assertInstanceOf(EasyPostObject::class, $response);
+        $this->assertEquals('ca_123', $response->id); // @phpstan-ignore-line
+        $this->assertEquals('FedexAccount', $response->type); // @phpstan-ignore-line
+        $this->assertNotNull($response->credentials); // @phpstan-ignore-line
+        $this->assertEquals('123456789', $response->credentials['account_number']);
+        $this->assertEquals('123456789-XXXXX', $response->credentials['mfa_key']);
+    }
+}