add toArray api to access token

src/Token/AccessToken.php

@@ -22,7 +22,11 @@
  *
  * @link http://tools.ietf.org/html/rfc6749#section-1.4 Access Token (RFC 6749, §1.4)
  */
-class AccessToken implements AccessTokenInterface, ResourceOwnerAccessTokenInterface, SettableRefreshTokenInterface
+class AccessToken implements 
+    AccessTokenInterface,
+    ArrayableAccessTokenInterface,
+    ResourceOwnerAccessTokenInterface,
+    SettableRefreshTokenInterface
 {
     /**
      * @var string
@@ -222,11 +226,11 @@ public function __toString()
     {
         return (string) $this->getToken();
     }
-
+    
     /**
      * @inheritdoc
      */
-    public function jsonSerialize()
+    public function toArray()
     {
         $parameters = $this->values;
 
@@ -248,4 +252,12 @@ public function jsonSerialize()
 
         return $parameters;
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function jsonSerialize()
+    {
+        return $this->toArray();
+    }
 }

src/Token/ArrayableAccessTokenInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace League\OAuth2\Client\Token;
+
+use ReturnTypeWillChange;
+
+interface ArrayableAccessTokenInterface
+{
+    /**
+     * Returns an array of parameters provided to the access token
+     *
+     * @return array
+     */
+    #[ReturnTypeWillChange]
+    public function toArray();
+}

test/src/Token/AccessTokenTest.php

@@ -244,4 +244,21 @@ public function testValues()
 
         self::tearDownForBackwardsCompatibility();
     }
+
+    public function testToArray()
+    {
+        $options = [
+            'access_token' => 'mock_access_token',
+            'refresh_token' => 'mock_refresh_token',
+            'expires' => time(),
+            'resource_owner_id' => 'mock_resource_owner_id',
+            'custom_thing' => 'i am a test!',
+        ];
+
+        $token = $this->getAccessToken($options);
+
+        $this->assertSame($token->toArray(), $token->jsonSerialize());
+
+        self::tearDownForBackwardsCompatibility();
+    }
 }