Handle response from Checkout API redirect

Controller/Process/Result.php

@@ -87,7 +87,6 @@ class Result extends \Magento\Framework\App\Action\Action
         $this->_orderHistoryFactory = $orderHistoryFactory;
         $this->_session = $session;
         $this->_adyenLogger = $adyenLogger;
-		$this->storeManager = $storeManager;
         parent::__construct($context);
     }
 
@@ -302,7 +301,6 @@ class Result extends \Magento\Framework\App\Action\Action
     protected function _authenticate($response)
     {
 
-    	if (!empty($response['merchantSig'])) {
 		$merchantSigNotification = $response['merchantSig'];
 
 			// do it like this because $_GET is converting dot to underscore
@@ -327,11 +325,8 @@ class Result extends \Magento\Framework\App\Action\Action
 		if (strcmp($merchantSig, $merchantSigNotification) === 0) {
 			return true;
 		}
-			return false;
-		} else{
-    		// send the payload verification payment\details request to validate the response
 
-		}
+		return false;
 
     }