credit debit card, aka credit cards with a balance get declined alot by stripes system. Real credit cards dont get declined often.
if it does:
- disable any vpn/proxy
- try buying it from a home connection/home pc. (mobile date is considered unsafe sometimes)
if it still doesnt let you pay, call your credit card provider (company). They are 24/7 open and theyll tell you why its being declined if its due to your card. if they say your card isnt locked/blocked then onetap blocked the payment.
Then you are forced to use another payment option.