> For the complete documentation index, see [llms.txt](https://developer.paywall.one/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.paywall.one/payment-orchestration-integration-document/physical-pos/5.-pair/async.md).

# Async

When physical POS providers use their own applications (such as Pavo, etc.), the flows used are referred to as 'Async' in the Paywall ecosystem.