> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.respona.com/guides/core-concepts/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.respona.com/_mcp/server.

# Core Concepts

## Docs

- [Orders & Placements](https://docs.respona.com/guides/core-concepts/orders-placements.md): The resource shape, quality tiers, pricing modifiers, and the state machine.
- [Concerns](https://docs.respona.com/guides/core-concepts/concerns.md): Raise and hold a message thread with the Respona team about a placement.
- [Credits & Billing](https://docs.respona.com/guides/core-concepts/credits-billing.md): How pricing, credits, the monthly pool, and refunds work.
- [Polling for Status](https://docs.respona.com/guides/core-concepts/polling-for-status.md): How to observe placement progress until it reaches a terminal state.
- [Webhooks](https://docs.respona.com/guides/core-concepts/webhooks.md): Get pushed a signed event the moment an order or placement changes status, instead of polling.