# Onefold > One-page checkout for OpoShop — email, delivery, shipping and payment in a single column on your own storefront, with express payment for returning shoppers and a live order summary. An enhancement layer: if anything goes wrong the shopper is handed straight back to your standard OpoShop checkout, on the same order. This app is built on the OpoShop platform. It is agent-friendly: the full API is described in OpenAPI and wrapped by an MCP server so an LLM can drive it directly. ## Machine interfaces - API contract (OpenAPI): https://tryonefold.fly.dev/openapi.json - API docs (Swagger): https://tryonefold.fly.dev/docs - Fuller LLM context: https://tryonefold.fly.dev/llms-full.txt - Release notes: https://tryonefold.fly.dev/api/release-notes - MCP endpoint (hosted): https://tryonefold.fly.dev/mcp — add this URL to Claude or any LLM client to drive the app in natural language. Auth with your own OpoShop store token via Authorization: Bearer . ## Auth Get an access token via POST /api/auth/login, then send it as `Authorization: Bearer ` on /api/* requests (and to the /mcp endpoint).