> 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/payment-data.md).

# 3. Payment Data Rules

- [3.1 Automatic Import](https://docs.syfu.io/payment-data/auto-import.md)
- [3.2 Manual Import](https://docs.syfu.io/payment-data/manual-import.md)
- [3.3 Eligible vs. Non-eligible (Summary)](https://docs.syfu.io/payment-data/eligible-ineligible.md)
- [3.4 BIND Rules](https://docs.syfu.io/payment-data/bind-rules.md)
- [3.5 Security & Anti-Fraud](https://docs.syfu.io/payment-data/security-fraud.md)
- [3.6 Troubleshooting / FAQ](https://docs.syfu.io/payment-data/faq.md)