https://developer.apple.com/support/apple-pay-sandbox/ has a bunch of test cards you can use for sandbox testing. I was able to add a sandbox Visa, MasterCard, and Discover card successfully to my sandbox test account. But any time I try to add an American Express card (from the list), I get "Could Not Add Card" "Try again later or contact your card issuer for more information." Anyone else encountered this?
phkwon
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