If you're getting a message ”We're sorry, this type of card is not supported at this time. Please try to add another card.“ it can mean the following:
Your card has the 3D Secure option as permanently required. In this case, our payment system provider (Stripe) cannot process the payment, because this card cannot be used for recurring payments.
In this case please try to use another card. If the problem persist please contact firstname.lastname@example.org we'll be happy to help you.