I had this on more than one card. The Pepper app doesn’t allow me to add a second Amex card to the payments setting even if the first one was deleted. Get an error message saying:
Error: This offer is available and applies to only 1 American Express card for one time use. Multiple (more than 1) American Express cards cannot be used or combined in conjunction with this offer.
That's unfair. How does Pepper even know which card you have an offer on? And what about if you just want to change to another card that doesn't even have the offer because you closed the other or because you have a new one that you want to spend on for a SUB or whatever reason?