Summary

Last Updated: April 2, 2025

The American Express Token Service (AETS) API enables Merchants and Service Providers to replace the actual Card Account Numbers with token numbers. Through AETS, when a Merchant or Service Provider submits a 15-digit Account Number provided by a Card Member, we respond with a unique 15-digit token. The returned token can only be used by the requester. This domain control makes the tokenized transaction more secure, and may help reduce the risk and cost of fraud. Also, tokens stay up-to-date as Card Members receive replacement cards over time. AETS manages the relationship between each token and its underlying Card Account, ensuring transactions continue without interruption when cards are replaced.