Why the payment keep getting rejected while make online reservation?

For your secure transaction, we’ve applied 3-D Secure, a protocol designed to be an additional security layer for online credit and debit card transactions. There are a other possibilities, the payment keep getting rejected. The card expiration date precedes the reservation date, you have reached your credit limit or exceeded its limit, or there is a computer error or connection error. If you are still unable to proceed with your payment after this stage, please contact your issuer bank for further assistance.