Hello,
Thank you for reaching out to us. We’re sorry to hear that you’re experiencing issues while trying to upgrade your account.
The error message you’re receiving about the wrong postcode could be due to a mismatch between the billing address you’ve entered and the one associated with your payment method. Please ensure that the billing address you’ve entered matches the one on file with your bank or payment provider.
Additionally, please ensure that your payment method supports payments in USD, supports subscription-based payments, and that international payments are turned on. Also, make sure that you are not using a prepaid card and that your IP is not a Proxy, or you are using any VPN or hosting service.
If everything from the above is enabled and working, you can also try using a credit card instead. You can also call your bank and ask what’s stopping the payment from going through and request them to approve it on your end.
If the issue persists, please send a screencast as well. You can use a tool like Loom to record the issue you’re facing.
We hope this helps resolve the issue. Looking forward to helping you further.
Sources:
Troubleshooting Payment Issues at Rank Math » Rank Math
How to Download or Update My Invoice » Rank Math