diff --git a/src/Provider/Buffer.php b/src/Provider/Buffer.php
index 749a7e5..53f81c2 100644
--- a/src/Provider/Buffer.php
+++ b/src/Provider/Buffer.php
@@ -4,11 +4,14 @@
 
 use League\OAuth2\Client\Provider\AbstractProvider;
 use League\OAuth2\Client\Token\AccessToken;
+use League\OAuth2\Client\Tool\BearerAuthorizationTrait;
 use Psr\Http\Message\ResponseInterface;
 use Tgallice\OAuth2\Client\Provider\Exception\BufferProviderException;
 
 class Buffer extends AbstractProvider
 {
+    use BearerAuthorizationTrait;
+
     /**
      * Buffer app base url
      *
@@ -51,7 +54,7 @@ public function getBaseAccessTokenUrl(array $params)
      */
     public function getResourceOwnerDetailsUrl(AccessToken $token)
     {
-        return $this->getApiUrl() . '/user.json?access_token=' . $token;
+        return $this->getApiUrl() . '/user.json';
     }
 
     /**
@@ -72,16 +75,6 @@ protected function getDefaultScopes()
         return [];
     }
 
-    /**
-     * @inheritdoc
-     */
-    protected function getAuthorizationHeaders($token = null)
-    {
-        return [
-            'Authorization' => 'Bearer '. (string) $token,
-        ];
-    }
-
     /**
      * @inheritdoc
      */
diff --git a/tests/Provider/BufferTest.php b/tests/Provider/BufferTest.php
index 8baa478..e150c92 100644
--- a/tests/Provider/BufferTest.php
+++ b/tests/Provider/BufferTest.php
@@ -48,8 +48,8 @@ public function testGetBaseAccessTokenUrl()
 
     public function testGetUrlUserDetails()
     {
-        $token = $this->getAccessToken('token');
-        $this->assertEquals($this->provider->getApiUrl() . '/user.json?access_token=token', $this->provider->getResourceOwnerDetailsUrl($token));
+        $token = $this->getAccessToken();
+        $this->assertEquals($this->provider->getApiUrl() . '/user.json', $this->provider->getResourceOwnerDetailsUrl($token));
     }
 
     public function testAuthorizationUrl()
@@ -97,10 +97,8 @@ public function testGetAccessToken()
     }
 
     /**
-     *
-     * @expectedException Tgallice\OAuth2\Client\Provider\Exception\BufferProviderException
-     *
-     **/
+     * @expectedException \Tgallice\OAuth2\Client\Provider\Exception\BufferProviderException
+     */
     public function testExceptionThrownWhenErrorObjectReceived()
     {
         $response = $this->prophesize(ResponseInterface::class);
@@ -117,12 +115,10 @@ public function testExceptionThrownWhenErrorObjectReceived()
     }
 
     /**
-     * @param null $tokenValue
-     *
      * @return AccessToken
      */
-    private function getAccessToken($tokenValue = 'token')
+    private function getAccessToken()
     {
-        return new AccessToken(['access_token' => $tokenValue]);
+        return $this->prophesize(AccessToken::class)->reveal();
     }
 }