> For the complete documentation index, see [llms.txt](https://apidocs.onekeypayments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://apidocs.onekeypayments.com/guides/knowledge-base.md).

# Knowledge Base

- [Countries Specifications](https://apidocs.onekeypayments.com/guides/knowledge-base/countries-specifications.md): Learn how to validate the country's specific details