> For the complete documentation index, see [llms.txt](https://doc.itick.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.itick.org/faq.md).

# FAQ

- [如何开通和续费套餐计划](https://doc.itick.org/faq/upgrade.md): ITick API 升级与迁移指南：了解 API 版本更新、接口变更、数据格式升级及平滑迁移方案，确保您的应用稳定运行。