diff --git a/CHANGELOG.md b/CHANGELOG.md
index b12d7209..c5dda903 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## v8.8.0 (2026-06-25)
+
+- Adds `params` to `requestPin` ensuring users can pass `easypost_details` to the call.
+
 ## v8.7.0 (2026-02-25)
 
 - Adds generic `makeApiCall` function
diff --git a/composer.json b/composer.json
index 50a8ed8a..352bfd89 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
   "name": "easypost/easypost-php",
   "description": "EasyPost Shipping API Client Library for PHP",
-  "version": "8.7.0",
+  "version": "8.8.0",
   "keywords": [
     "shipping",
     "api",
diff --git a/lib/EasyPost/Constant/Constants.php b/lib/EasyPost/Constant/Constants.php
index 5c03b8cc..bad59171 100644
--- a/lib/EasyPost/Constant/Constants.php
+++ b/lib/EasyPost/Constant/Constants.php
@@ -11,7 +11,7 @@ abstract class Constants
     const BETA_API_VERSION = 'beta';
 
     // Library constants
-    const LIBRARY_VERSION = '8.7.0';
+    const LIBRARY_VERSION = '8.8.0';
     const SUPPORT_EMAIL = 'support@easypost.com';
 
     // Validation
diff --git a/lib/EasyPost/Service/FedExRegistrationService.php b/lib/EasyPost/Service/FedExRegistrationService.php
index dd0f29be..6843494c 100644
--- a/lib/EasyPost/Service/FedExRegistrationService.php
+++ b/lib/EasyPost/Service/FedExRegistrationService.php
@@ -33,14 +33,14 @@ public function registerAddress(string $fedexAccountNumber, mixed $params = null
      *
      * @param string $fedexAccountNumber
      * @param string $pinMethodOption
+     * @param mixed $params
      * @return mixed
      */
-    public function requestPin(string $fedexAccountNumber, string $pinMethodOption): mixed
+    public function requestPin(string $fedexAccountNumber, string $pinMethodOption, mixed $params = null): mixed
     {
-        $wrappedParams = [
-            'pin_method' => [
-                'option' => $pinMethodOption,
-            ],
+        $wrappedParams = $this->wrapPinValidation($params);
+        $wrappedParams['pin_method'] = [
+            'option' => $pinMethodOption,
         ];
         $url = "/fedex_registrations/{$fedexAccountNumber}/pin";
 
diff --git a/test/EasyPost/FedExRegistrationTest.php b/test/EasyPost/FedExRegistrationTest.php
index afbbda6d..e7226271 100644
--- a/test/EasyPost/FedExRegistrationTest.php
+++ b/test/EasyPost/FedExRegistrationTest.php
@@ -112,8 +112,13 @@ public function testRegisterAddress(): void
     public function testRequestPin(): void
     {
         $fedexAccountNumber = '123456789';
+        $params = [
+            'easypost_details' => [
+                'carrier_account_id' => 'ca_123',
+            ],
+        ];
 
-        $response = self::$client->fedexRegistration->requestPin($fedexAccountNumber, 'SMS');
+        $response = self::$client->fedexRegistration->requestPin($fedexAccountNumber, 'SMS', $params);
 
         $this->assertInstanceOf(EasyPostObject::class, $response);
         $this->assertEquals('sent secured Pin', $response->message); // @phpstan-ignore-line