Here's what you can do:
- Call the number at the back of your card. Please confirm with the bank that your card has been enabled for online transactions and also ask to enable *Non 3D Checkout*.
- Wait 1 hour before making payment again.
Alternatively, try making payment with a different debit card, credit cards are preferred. Note that online transactions via debit cards may not go through during the bank's maintenance hours between 12 am to 5 am.
Local banks have strict guidelines on debit cards, even though you've enabled online payment before, it may decline subsequent transactions.