# iACC

> iACC is a multi-tenant accounting platform for Thai businesses (tour operators, travel agencies, water delivery, transport, trading). Third-party apps, iACC's own modules and AI agents connect through a REST Core Accounting API (preview), a REST Sales Channel API (live), an MCP server (live) and signed webhooks. Your credential decides the company; no endpoint takes a company id. Amounts and VAT are computed by iACC; read them, never recompute them. Documentation is bilingual: replace `.en.md` with `.th.md` for Thai.

## Start here

- [Overview](https://iacc.f2.co.th/developers/raw.php?f=overview.en.md): surfaces, base URLs, auth, tenancy, conventions
- [All documentation in one file](https://iacc.f2.co.th/developers/raw.php?f=all.en.md): every page below, concatenated
- [Human-readable portal](https://iacc.f2.co.th/developers/)

## APIs

- [Core Accounting API v1 guide](https://iacc.f2.co.th/developers/raw.php?f=core-api.en.md): parties, items, document chain (quotation → invoice → tax invoice → receipt), payments, reports. PREVIEW: not live yet
- [Core Accounting API v1 OpenAPI 3.1](https://iacc.f2.co.th/developers/raw.php?f=core-v1.yaml): machine-readable contract
- [Sales Channel API v1 reference](https://iacc.f2.co.th/developers/raw.php?f=channel-api.en.md): orders, tour bookings, availability, catalog, payment methods, knowledge sync, website AI chat. LIVE. Base `/api.php/v1`, API key + secret
- [Webhooks & events](https://iacc.f2.co.th/developers/raw.php?f=events.en.md): delivery format, HMAC-SHA256 signature verification, event names

## AI agents

- [MCP server](https://iacc.f2.co.th/developers/raw.php?f=mcp.en.md): endpoint `https://iacc.f2.co.th/mcp.php`, stateless Streamable HTTP, OAuth 2.1 or personal token, live tool catalogue, two-step confirmation for writes
- [OAuth protected resource metadata](https://iacc.f2.co.th/.well-known/oauth-protected-resource)

## Building on iACC

- [Build an app or module](https://iacc.f2.co.th/developers/raw.php?f=build-a-module.en.md): the one rule (use the contract, never the database), data ownership, typical flow, go-live checklist
- [Storefront templates](https://iacc.f2.co.th/developers/raw.php?f=storefront-templates.en.md): build a storefront website on the Sales Channel API

## Optional

- [Thai overview](https://iacc.f2.co.th/developers/raw.php?f=overview.th.md)
- [All documentation in Thai](https://iacc.f2.co.th/developers/raw.php?f=all.th.md)