diff --git a/README.md b/README.md
index d90ae69..4c86b33 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,10 @@ try {
 }
 ```
 
-> see more examples on [League/oauth2-client](https://oauth2-client.thephpleague.com/usage/)
+> see more examples on [league/oauth2-client](https://oauth2-client.thephpleague.com/usage/)
 
+## Error handling
+
+Unfortunately the response body in case of an error is not consistent. To better understand the reason a request is 
+failed call the `IdentityProviderException::getResponseBody` method.
 
diff --git a/src/Provider/Trustpilot.php b/src/Provider/Trustpilot.php
index f15b07a..a57f58c 100644
--- a/src/Provider/Trustpilot.php
+++ b/src/Provider/Trustpilot.php
@@ -38,6 +38,10 @@ public function getBaseAuthorizationUrl()
      */
     public function getBaseAccessTokenUrl(array $params)
     {
+        if (!empty($params['grant_type']) && $params['grant_type'] === 'refresh_token') {
+            return 'https://api.trustpilot.com/v1/oauth/oauth-business-users-for-applications/refresh';
+        }
+
         return 'https://api.trustpilot.com/v1/oauth/oauth-business-users-for-applications/accesstoken';
     }
 
@@ -76,8 +80,7 @@ protected function getDefaultScopes()
     protected function checkResponse(ResponseInterface $response, $data)
     {
         if ($response->getStatusCode() >= 400) {
-            $message = $data['fault']['faultstring'] ?? $response->getReasonPhrase();
-            throw new IdentityProviderException($message, $response->getStatusCode(), $data);
+            throw new IdentityProviderException($response->getReasonPhrase(), $response->getStatusCode(), $data);
         }
     }
 
diff --git a/tests/Provider/TrustpilotTest.php b/tests/Provider/TrustpilotTest.php
index 5081e4a..042a748 100644
--- a/tests/Provider/TrustpilotTest.php
+++ b/tests/Provider/TrustpilotTest.php
@@ -92,6 +92,38 @@ public function testGetAccessToken()
         $this->assertNotEmpty($accessToken->getResourceOwnerId());
     }
 
+    public function testRefreshAccessToken()
+    {
+        $accessToken = new AccessToken([
+            'access_token' => '52f30f0e9bd8d74c8a7e7eb2',
+            'resource_owner_id' => '2d41b60214b2fc6f2e2647e8',
+            'refresh_token' => 'c91edc1ad4d069b117ed7dc7',
+            'expires_in' => "359999",
+        ]);
+
+        $response = new Response(200, ['Content-Type' => 'application/json']);
+        $response->getBody()->write(file_get_contents(__DIR__ . '/../data/token.json'));
+
+        $client = new Client([
+            'handler' => HandlerStack::create(
+                new MockHandler([$response])
+            )
+        ]);
+
+        $this->provider->setHttpClient($client);
+
+        $accessToken = $this->provider->getAccessToken(
+            'refresh_token', [
+                'refresh_token' => $accessToken->getRefreshToken()
+            ]
+        );
+
+        $this->assertFalse($accessToken->hasExpired());
+        $this->assertNotEmpty($accessToken->getToken());
+        $this->assertNotEmpty($accessToken->getRefreshToken());
+        $this->assertNotEmpty($accessToken->getResourceOwnerId());
+    }
+
     public function testGetResourceOwner()
     {
         $accessToken = new AccessToken([
@@ -131,10 +163,9 @@ public function testGetAccessTokenFailure(ResponseInterface $response)
     {
         $body = $response->getBody()->getContents();
         $data = $body ? json_decode($body, true) : [];
-        $message = $data['fault']['faultstring'] ?? $response->getReasonPhrase();
 
         $this->expectExceptionObject(
-            new IdentityProviderException($message, $response->getStatusCode(), $data)
+            new IdentityProviderException($response->getReasonPhrase(), $response->getStatusCode(), $data)
         );
 
         $client = new Client([
@@ -156,9 +187,9 @@ public function testGetAccessTokenFailure(ResponseInterface $response)
     public function provideFailure()
     {
         return [
-            [new Response(401, [], json_encode(['fault' => ['faultstring' => 'Token Expired']]))],
-            [new Response(401, ['Content-Type' => 'text/plain'])],
+            [new Response(401, [], '{"reason": "Authentication Failed"}')],
             [new Response(429, ['Content-Type' => 'text/plain'])],
+            [new Response(503, ['Content-Type' => 'text/plain'])],
         ];
     }