Since this happens in three browsers, it may be worth checking whether the payment form has a separate postal-code field beside the card details, even after you’ve entered your billing address. For the support link, try right-clicking and copying its address; if it starts with “mailto:”, you can paste the email address into your email app. I run https://stardewvalleyapk.app/ and am not affiliated with RiffTrax, so these are troubleshooting suggestions rather than a confirmed fix.
Since this happens in three browsers, it may be worth checking whether the payment form has a separate postal-code field beside the card details, even after you’ve entered your billing address. For the support link, try right-clicking and copying its address; if it starts with “mailto:”, you can paste the email address into your email app. I run https://stardewvalleyapk.app/ and am not affiliated with RiffTrax, so these are troubleshooting suggestions rather than a confirmed fix.