I wish more people knew about fraud protection and how not to trigger it. If you want to pay in an unusual way, ask support if it's allowed or causes issues.
If you just try and imitate the average customer you will almost always be on the happy path, but ordering multiple books with multiple cards in a short period... I think that would trigger any decent fraud protection and not just at Amazon scale.
If you just try and imitate the average customer you will almost always be on the happy path, but ordering multiple books with multiple cards in a short period... I think that would trigger any decent fraud protection and not just at Amazon scale.