Which payment method Amazon accept?

Hi, does anybody know which payment method Amazon accept now?
I tried to create a new account and make a purchase via Visa Vanilla Gift Card, but Amazon rejected transaction and ask additional documents.
Need to find the cheapest way to pay for an order. Cheapest I mean fee charged for the transaction, for example, Vanilla cost $4.95 per activate gift card. Any virtual card or another method?

Any ideas much appreciate!

I think they only take CC..