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

# Overview

Subscribe adds an email address to the workspace's newsletter subscribers, where the merchant can see and export it.

* Subscribing an address that is already on the list succeeds and changes nothing.
* An address that had unsubscribed is subscribed again.
* The endpoint records the subscription. It does not send a confirmation email.

A shopper can subscribe 5 times in 15 minutes.