diff --git a/src/Common/Service/AbstractService.php b/src/Common/Service/AbstractService.php
index 1fafd42..4fcfcee 100644
--- a/src/Common/Service/AbstractService.php
+++ b/src/Common/Service/AbstractService.php
@@ -132,7 +132,7 @@ protected function determineRequestUriFromPath($path)
                 $path = substr($path, 1);
             }
 
-            $uri->setPath($uri->getPath() . '/' . $path);
+            $uri->setPath(rtrim($uri->getPath(), '/') . '/' . $path);
         }
 
         return $uri;
diff --git a/src/OAuth1/Service/FitBit.php b/src/OAuth1/Service/FitBit.php
index d2ed3bd..788f252 100644
--- a/src/OAuth1/Service/FitBit.php
+++ b/src/OAuth1/Service/FitBit.php
@@ -55,4 +55,25 @@ protected function parseAccessTokenResponse($responseBody)
 
         return $token;
     }
+      /**
+     * Builds the authorization header array.
+     *
+     * @return array
+     */
+    protected function getBasicAuthorizationHeaderInfo()
+    {
+        $dateTime = new \DateTime();
+        // Substracting 330 (5mins and 30s) seconds because sometimes execution is late
+        $timestamp = $dateTime->format('U') - 330;
+        $headerParameters = [
+            'oauth_callback'         => $this->credentials->getCallbackUrl(),
+            'oauth_consumer_key'     => $this->credentials->getConsumerId(),
+            'oauth_nonce'            => $this->generateNonce(),
+            'oauth_signature_method' => $this->getSignatureMethod(),
+            'oauth_timestamp'        => $timestamp,
+            'oauth_version'          => $this->getVersion(),
+        ];
+
+        return $headerParameters;
+    }
 }
diff --git a/tests/Unit/OAuth2/Service/DeviantArtTest.php b/tests/Unit/OAuth2/Service/DeviantArtTest.php
index cce1d7c..d13bf56 100644
--- a/tests/Unit/OAuth2/Service/DeviantArtTest.php
+++ b/tests/Unit/OAuth2/Service/DeviantArtTest.php
@@ -77,7 +77,7 @@ public function testBaseApiUriIsCorrect()
         $service->expects($this->once())->method('httpRequest')->willReturnArgument(0);
 
         $this->assertEquals(
-            'https://www.deviantart.com/api/v1/oauth2//api/method',
+            'https://www.deviantart.com/api/v1/oauth2/api/method',
             (string) $service->request('/api/method')
         );
     }