A. Check if your credit card has expired or if there are any holds on your account. Contact your bank to ensure there are no issues with your card. If the card is valid, try clearing your browser's cache and cookies, then attempt the payment again. Alternatively, try using a different browser or device to see if the issue persists.

B. If the problem continues, consider using a different payment method such as PayPal or a different credit card. Ensure that the billing address matches the one on file with your bank.