Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
Could you please ensure that your payment method supports the following?
– Payments in USD $
– Supports subscription-based payments
– You are not using a prepaid card
– International payments are turned on
Please note that a credit card is needed to be verified with a PayPal account for automatic subscriptions in case there is no balance in your PayPal account, and that is a requirement set forth by PayPal, not us.
You can try using a credit card in place of the other methods if everything from above is enabled and functioning properly.
Also, please make sure that the flag during checkout is showing the correct country at the top right corner. Here’s an example screenshot:

If you are trying to validate data while accessing the website from a different location, you need to force the change of country in the dropdown.
Lastly, if you are using a Proxy or VPN, please disable that and use your actual ISP to update your payment method.
Regarding the affiliate program, could you please confirm if you have already replied to our email like my colleague mentioned in your previous ticket?
Looking forward to helping you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.