# recv.fund > Self-hosted payment software for merchant-owned checkout, invoices, deposits, sweeps and payouts. Merchant APIs run on the merchant's own origin, not this website. ## Agent integration - [AI agent guide](https://docs.recv.fund/agents/index.md): Complete setup brief and workflows. - [Documentation index](https://docs.recv.fund/llms.txt): Current documentation, grouped by area. - [Complete documentation](https://docs.recv.fund/llms-full.txt): Full-text documentation for agents. - [Payment integration](https://docs.recv.fund/agents/payment-integration.md): Exact amounts, payment states, signature verification and retry rules. - [Security and permissions](https://docs.recv.fund/agents/security-and-permissions.md): Credential scopes, human authorization and contract review evidence. ## Installation discovery On the merchant's installation, inspect GET /api/v1/integration/capabilities and /api-json (OpenAPI). GET /api/v1/integration/readiness uses the project API-Key header. Never send credentials to recv.fund or docs.recv.fund. Project keys can request payouts; they are not read-only. Use testnet first and verify confirmed server state before fulfillment. A readable contract or passing test is not a guarantee of safety.