Hi Pisces,
Sorry to hear you are having issues with your card. Mastercard and Visa are accepted card payment methods and if you are based in the USA, if you previously upgraded your account using American Express (AMEX) then you can also use AMEX as an accepted payment method. Additionally, you can also use PayPal to add credit to your account. Can you advise what type of card you are using?
You can also refer to this helpful community article, which explain other reasons why your card may not be accepted: Why has my card payment been declined?
Thanks and kind regards,
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