src/Gateways/CitrusGateway.php
public function response($request)
    {
        $response = $request->all();

        $response_hash = $this->decrypt($response);

        if($response_hash!=$response['signature']){
            return 'Hash Mismatch Error';
        }

        return $response;
    }
public function response($request)
    {
        $response = $request->all();

        $response_hash = $this->decrypt($response);

        if($response_hash!=$response['signature']){
            return 'Hash Mismatch Error';
        }

        return $response;
    }
Check Response
@param $request
@return array