> ## Documentation Index
> Fetch the complete documentation index at: https://developers.meet-oj.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Standards

> The open standards the API follows.

| Area              | Standard                                          | Notes                                                                            |
| ----------------- | ------------------------------------------------- | -------------------------------------------------------------------------------- |
| Contract          | OpenAPI 3.1                                       | The [API reference](/api-reference) and client libraries are generated from it.  |
| Auth              | OAuth 2.0 client credentials (RFC 6749)           | Scoped tokens, one client per environment.                                       |
| Errors            | RFC 9457 Problem Details                          | `application/problem+json`, plus `code`, `param` and `request_id`.               |
| Idempotency       | IETF `Idempotency-Key`                            | Keys are kept for 24 hours. A replay returns `Idempotent-Replayed: true`.        |
| Tracing           | W3C Trace Context                                 | `traceparent` is accepted. Every response carries `OJ-Request-Id`.               |
| Webhooks          | Standard Webhooks                                 | HMAC-SHA256 signatures, retries for 72 hours, replay from `GET /events`.         |
| Streaming         | Server-Sent Events                                | Resume with `Last-Event-ID`.                                                     |
| Per-referral push | JWT / JWKS or HMAC                                | Keys are published at `/.well-known/jwks.json`.                                  |
| Agents            | MCP                                               | Works with Claude, ChatGPT, Google ADK, OpenAI Agents SDK and other MCP clients. |
| Agent-to-agent    | A2A v1.0                                          | Coming soon.                                                                     |
| Embed transport   | JSON-RPC 2.0 over `postMessage`, Web Components   |                                                                                  |
| Conventions       | Prefixed ids, amounts in cents, cursor pagination |                                                                                  |