So I have already reached out via the help link on the 2Checkout page yeasterday. The responses are slow and my subscription is set to expire today so I'm posting here too without personal info.
The form refuses to take my new American Express card info. Keeps saying "Invalid Card Type." Their first advice today was simply to clear the cache and try again. Nothing. I replied, but I may not hear anything until tomorrow. There are three credit cards listed on the payment form, JCB, Carte Bleue and Dankort. That's it. Now I'm stuck.
Any advice on this?