There are a few possibilities:
Make sure you are not using a proxy internet connection. A direct connection to internet is required for security purpose.
Our Payment Gateway opens in a new Windows. Make sure that pop up blocking software/features are turned off.
Make sure the input details are correct.
Make sure the card expiration date does not precede the reservation date.
Make sure you have not reached your credit limit.
If you get an error apart from the reasons above, please contact us at info@absoluteasiatravel.com or hotline: +84 989 695 371