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

# Developer Guide

- [Introduction](https://docs.oyf.io/developer-guide/introduction.md)
- [Basic concepts](https://docs.oyf.io/developer-guide/basic-concepts.md)
- [Getting the Currency](https://docs.oyf.io/developer-guide/getting-the-currency.md)
- [Make Invoice (Order)](https://docs.oyf.io/developer-guide/make-invoice-order.md)
- [Get Invoice/Order Status](https://docs.oyf.io/developer-guide/get-invoice-order-status.md)