> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://developer.americanexpress.ferndocs.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://developer.americanexpress.ferndocs.com/_mcp/server.

# Introduction

The **American Express Token Service (AETS) API** connects Card Issuers, Merchants, and Service Providers to mobile and digital payments using state-of-the-art token technology to enhance the checkout experience. Please stay tuned as we expand the scope in the future to include third-party issued American Express® Cards and expand AETS to additional countries.