# Usual

> Subscriptions for Shopify stores, with a REST API (https://regular-subs.fly.dev/api/v1) and an MCP server (https://regular-subs.fly.dev/mcp) that agents can use safely: every change can be previewed, riskier changes wait for a person's approval, and almost everything can be undone.

All pages in one file: https://regular-subs.fly.dev/llms-full.txt

## Get started

- [Overview](https://regular-subs.fly.dev/docs/md/index): What you can build, and the two ways in.
- [Quickstart](https://regular-subs.fly.dev/docs/md/quickstart): Your first call in three minutes.
- [Usual Subagent](https://regular-subs.fly.dev/docs/md/mcp): Connect Claude, Cursor or VS Code to your store over MCP.

## Concepts

- [How changes work](https://regular-subs.fly.dev/docs/md/concepts/changes): Commands, plans, approvals and undo.
- [Keys and permissions](https://regular-subs.fly.dev/docs/md/concepts/keys): API keys, agent keys and what each may do.
- [Errors and retries](https://regular-subs.fly.dev/docs/md/concepts/errors): Error codes, safe retries and pagination.
- [Data and privacy](https://regular-subs.fly.dev/docs/md/concepts/data): What we keep, and who can see it.

## Recipes

- [Handle a cancel request](https://regular-subs.fly.dev/docs/md/recipes/cancel-request): One offer, then cancel if they say no.
- [Chase failed payments](https://regular-subs.fly.dev/docs/md/recipes/failed-payments): Find failing renewals and get cards updated.
- [Move from Recharge](https://regular-subs.fly.dev/docs/md/recipes/move-from-recharge): Bring every subscription over in an afternoon.
- [Pause everyone on a product](https://regular-subs.fly.dev/docs/md/recipes/pause-a-product): For a stock-out or a recall.

## Reference

- [REST API](https://regular-subs.fly.dev/docs/md/reference/api): Every endpoint, with parameters and permissions.
- [Commands](https://regular-subs.fly.dev/docs/md/reference/commands): Every change you can make, with its input.
- [MCP tools](https://regular-subs.fly.dev/docs/md/reference/mcp-tools): Every tool an agent can call.

## Machine-readable

- [OpenAPI 3.1](https://regular-subs.fly.dev/api/v1/openapi.json): every REST endpoint and command