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

# Apps

- [Introduction](https://developer.vario-software.de/documentation/apps/introduction.md): What a VARIO Cloud App is, how it integrates with the ERP, and how a private App becomes public.
- [Quickstart](https://developer.vario-software.de/documentation/apps/quickstart.md): Build and run your first App using the VARIO App Framework and the demo app.
- [Authentication](https://developer.vario-software.de/documentation/apps/authentication.md): How an App verifies calls from VARIO Cloud and authenticates its own API requests.
- [Create an App](https://developer.vario-software.de/documentation/apps/create-an-app.md): Register an App in the Admin-Center and obtain its API credentials.
- [App Manifest](https://developer.vario-software.de/documentation/apps/app-manifest.md): Reference for every manifest field — metadata, URLs, permissions and UI integrations.
- [UI Integration](https://developer.vario-software.de/documentation/apps/ui-integration.md): How an App and the ERP talk to each other inside the iframe — postMessage protocol, dialogs, height, widgets.
- [App Backends](https://developer.vario-software.de/documentation/apps/app-backends.md): How an app registers a backend and takes over a role in the ERP.
- [Onlineshops and Marketplaces](https://developer.vario-software.de/documentation/apps/app-backends/onlineshops-and-marketplaces.md): Connect a shop or marketplace: sales channels, listings, outbound sync and order import.
- [Shipping / Carrier](https://developer.vario-software.de/documentation/apps/app-backends/shipping-carrier.md): Connect a carrier: carrier types, label creation, tracking and write-back.
- [Banking](https://developer.vario-software.de/documentation/apps/app-backends/banking.md): Deliver account transactions into the ERP and send payments out.
- [Financial Accounting](https://developer.vario-software.de/documentation/apps/app-backends/financial-accounting.md): Export bookings and debtor/creditor master data to an accounting system.
- [POS Payment Methods](https://developer.vario-software.de/documentation/apps/app-backends/pos-payment-methods.md): Provide a payment method the cash register can use, fulfilled by your app.
- [FAQ](https://developer.vario-software.de/documentation/apps/faq.md): Frequently asked questions about App authentication, installation, migrations, manifests and UI integrations.


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