If your credit card got rejected, it could be because of the payment hitting some kind of fraud prevention system that is common for credit card systems nowadays (think of it as a kind of "Spam Filter" for payments).
Normally, this is easily solved by contacting your bank / credit card company and by instructing them to authorise payments originating from our payment provider FastSpring / Bright Market LLC.
In case this doesn't solve your problem please consider paying through PayPal.
Please contact our support team with any additional questions or issues regarding your payment.
In case you have further questions, don't hesitate to contact the support team via the chat or support@walls.io!