The common reasons for payment errors are the type of card used, insufficient funds, and banks not allowing the transaction. Here are some workarounds to address the issue:
Please make sure to use a Visa, Mastercard, or AMEX card. Other types of cards are not accepted currently.
Make sure there is sufficient money in your account.
Try a different card or use PayPal, if available.
Call your bank if the transaction is not allowed.