> 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/ecr-information.md).

# POS Cash Register Interface

- [Getting Started](https://docs.payrexx.com/developer/ecr-information/ecr-information.md): The Payrexx Cash Register integration enables easy integration of our card readers.
- [Nexgo OTP](https://docs.payrexx.com/developer/ecr-information/nexgo-pariring.md): Step-by-step guide for generating the Pairing OTP on NexGo N-Series terminals.
- [Reference](https://docs.payrexx.com/developer/ecr-information/endpoints.md): A list of endpoints and their compatibility with our POS-Terminals