> For the complete documentation index, see [llms.txt](https://docs.syfu.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.syfu.io/checkin-bind.md).

# 4. Check-in & BIND FAQ / Failure Cases

- [4.1 Success & Failure Examples](https://docs.syfu.io/checkin-bind/success-failure.md)
- [4.2 Common Failure Cases](https://docs.syfu.io/checkin-bind/common-failures.md)
- [4.3 Frequently Asked Questions (FAQ)](https://docs.syfu.io/checkin-bind/faq.md)
- [4.4 Fraudulent Use & Penalties (Important)](https://docs.syfu.io/checkin-bind/penalties.md)