There was an error adding this card error on Testing Payments

Thanks for that confirmation, @GateCheckCheryl . I’m out of ideas too, and so the next step will be for us to take a direct look at this for you.

We’ll need to access your account in order to do so. While we’re not able to provide account-specific support via the Shopify Community at this time, we’d be happy to continue assisting you through live chat, email, or callback. Please visit the Shopify Help Center and log in to your account to create a support request.

Let me know what you find out!