Cannot add credit card

Hello, yesterday I was going to add a credit card for my small application to use free tier in cause my old hosting was going to end its free. By the way, when I add the credit card, it says “Your card was declined. Please try another card”. I read old post about this error but still cannot find a solution. Anyone has any idea? I need to complete the payments before this day cause my website will stop working if I cannot migrate to on time