After completing your application for an American Express Credit Card, a 14-Digit Reference number will be shown to you on the American Express Page (examples below). Save this number for the redemption process.
An email will be sent to you from Cardable with redemption instructions. Alternatively, you can go straight to the redemption form here.
The 14 Digit Reference Number can be found on the Thank You Page, right after you’ve completed your application on the American Express Website.
Sample Screenshot below.