The nonce returned to the client callback handler from American Express is a standard payment method nonce that you can use on your server like you would any other nonce. You can refer to our transactions guide for details about creating a transaction from a nonce.
Amex Express Checkout cards have extra fields on the payment method which show the expiration and last 4 digits of the customer’s underlying credit card. You can use these values to help your customers remember which credit card they used on your website. For more information about payment methods, you can refer to our payment methods guide.
||Expiration date of the card member’s physical card||"02/16"|
||Last 4 digits of the card member’s physical card||"1008"|