add custom callback and return url

src/RazerPayDriver.php

                 'amount', 'orderid', 'bill_name', 'bill_email', 'bill_mobile',
                 'bill_desc', 'country', 'verify_code', 'currency'
             ),
-            Arr::only($this->config->get('payment.gateway.razerpay.options', []), ['channel']),
-            Arr::only($options, ['channel'])
+            Arr::only($this->config->get('payment.gateway.razerpay.options', []), ['channel', 'returnurl', 'callbackurl']),
+            Arr::only($options, ['channel', 'returnurl', 'callbackurl'])
         );
         return "$this->endpoint/MOLPay/pay/$this->merchant_id/?" .
             http_build_query($query);