If you get this error when trying to pay with your credit card, it is usually because you are trying to use a card that has already been used on a different GamerPay account. Keep in mind, you may only create 1 GamerPay account 1️⃣
You may see a (pending) transaction in your bank account statement, which is completely normal - however, the funds will not be charged by GamerPay. You can learn more about that here 💳