Introduction

Enhanced Authorization enables Merchants to share additional transaction data with American Express, such as email address, IP address, shipping information, phone numbers, and more. American Express uses its best-in-class machine learning models to link together thousands of factors including the Customer spending patterns, Merchant profiles and real-time transaction data to significantly improve our ability to assess risk and distinguish between a legitimate Customer and a fraudster.

The Enhanced Authorization service is set up to first receive the Enhance Authorization API call, and then the Authorization message, with some time gap between the two calls (e.g., 200 milliseconds).