Adding Test Credit Card to Apple Pay I'm trying to add a test credit card in my Applet Wallet (with icloud and app store signed in to my developer account). 

I found a list of test credit cards available from Apple's page https://developer.apple.com/apple-pay/sandbox-testing/

However, most of these cards (tried about 10-15 randomly selected ones), threw either invalid card or unsupported errors.

Has anyone encountered the same issue?
The first thing I would do is set my region to one of the supported ones for test and make sure I remove all payment from wallet and settings. 

Then create a new sandbox account. The common item is mixing the production stream with sandbox stream and burning your account status in the sandbox. 


  Important: If you mistakenly use a sandbox tester account to sign in to a production environment, like iTunes, on your test device instead of your test environment, the sandbox account becomes invalid and can’t be used again. If this happens, create a new sandbox tester account with a new email address.


It’s unlikely your developer account would be valid on device when testing payments in a sandbox with sandbox banking details.