Fiest is a restaurant POS and management platform built in Helsinki. This page lists the developer surfaces by name, with the canonical URL for each, so an integration or an AI agent can find them without searching. The documentation itself lives at https://docs.fiest.io.
The Fiest Partner API gives approved integrations scoped, read-and-write access to the restaurants a Fiest owner or administrator explicitly authorizes: restaurant profiles, accounting summaries, orders, menus and catalog imports.
Access is reviewed. Fiest registers each client and its redirect URIs; there is no self-serve production key. Write access is enabled per client after a separate review.
The reference pages are generated from one OpenAPI 3.1 document, published in two formats.
The fiestOAuth security scheme in the document lists every OAuth scope with its meaning, and each operation names the scopes it requires, so a client can request least-privilege access from the contract alone.
Partner API access uses OAuth 2.1 authorization code with PKCE (S256). Access tokens are audience bound: a Partner API token is not valid on the MCP server, and the reverse.
Fiest MCP lets Claude, ChatGPT, Claude Code, Codex and other MCP clients work with a restaurant's live Fiest data on the owner's behalf: sales, orders, menus, inventory, opening hours and accounting summaries. Reads are immediate; every write is confirmed by the user and audited.
Partner registration, sandbox access and integration questions: sales@fiest.io. Security reports: https://fiest.io/.well-known/security.txt. Product questions from restaurants: https://fiest.io/en/contact.