> For the complete documentation index, see [llms.txt](https://docs.payfacto.com/centre-de-documentation-payfacto/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payfacto.com/centre-de-documentation-payfacto/documentation-canada/applications/secure-payment/app-to-app-guide-utilisateur/application-app-to-app.md).

# Application App to App

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