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

# Tap to Pay App-to-App Interface

- [Getting Started](https://docs.payrexx.com/developer/tap-to-pay-app-to-app-interface/getting-started.md): The Payrexx Tap to Pay App-to-App SDK enables easy integration of our Android Tap to Pay solution.