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by kay_o 142 days ago
Any card on your account should work, last 4 must match, I have never entered number or scan QR
1 comments

Oh, then my watch should suffice. Okay, I shall try it next time with a Prime discounted product!
Gpay/Apple Pay added card etc will not match hand-entered card on Amazon site's number since last 4 differs IIRC
Oh thank you for that. That explains it.