> For the complete documentation index, see [llms.txt](https://qosic.gitbook.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://qosic.gitbook.io/merchant-api/integration-rules.md).

# integration-rules

- [fees and balances](https://qosic.gitbook.io/merchant-api/integration-rules/fees-and-balances.md)
- [idempotency and retries](https://qosic.gitbook.io/merchant-api/integration-rules/idempotency-and-retries.md)
- [error handling](https://qosic.gitbook.io/merchant-api/integration-rules/error-handling.md)