For those who are wondering how to get the $15 Amazon gift card. Make sure you added the card AFTER 8:00 PM on Sept 17th EST Also for previous offers with Samsung Pay, you had to register, not sure if that is the case for this offer too, but check the Samsung Pay app.
did you register via Samsung pay? I did mine today and got the email instantly.. once you open Samsung pay, tap on the offer and hit register. then add your card (if you already added it remove it.) once you register and add the card you will see another button that says check status.