Hello,
We apologize for the issue you are facing while trying to make a payment. The error message you are encountering typically indicates that there may be a problem with the payment method or settings. Here are some troubleshooting steps you can follow:
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Select Your Current Location: Ensure that the country displayed in the dropdown menu at the top-right corner of the checkout page is correct. If it shows a different country, click on it and select the correct one.

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Turn Off Your VPN or Proxy: If you have a VPN or proxy server enabled, please turn it off. Some browsers also have built-in VPNs, so check your browser settings to ensure it’s disabled.

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Check Your Payment Method: Make sure your credit or debit card supports international payments and subscription-based payments. Rank Math only accepts credit or debit cards, and prepaid cards will not work.
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Contact Your Bank: If everything seems correct and the issue persists, consider contacting your bank to understand why the payment is being blocked and request them to approve it.
If you continue to experience issues after trying these steps, please reply to this ticket with any additional details or a screencast of the problem, and a human agent from our support team will assist you further.
Thank you for your patience, and we look forward to helping you resolve this issue!
Sources:
Troubleshooting Payment Issues at Rank Math » Rank Math
VPN is not ON, there is no adblocker, select county is correct too, what other issues may be?
used a different CC. It is done. Do I need to use the same free install, and would I be able to update from wpadmin, or need to download the new pro version and install Rankmath again?
Hello,
Glad to know that you’re able to make the payment.
The PRO plugin must be installed to make use of the PRO feature. You may follow this guide to proceed with: https://rankmath.com/kb/how-to-upgrade-to-rank-math-pro/
Looking forward to helping 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.