Have all your American Express Offers added automatically eveytime you login to your AmEx online account.
With this extension, every time you log in to your americanexpress.com account all available offers will be added to your card. After you add this extension, just login to your account and the offers will be automatically added.
Note: if you use popup or adblockers such as Ghostery, it's possible they will prevent this extension from running. If you go to the americanexpress.com website and your offers aren't automatically added, you probably just need to allow this extension to work in your adblocker settings.