> For the complete documentation index, see [llms.txt](https://help.retailys.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.retailys.com/system-retailys/settings/extensoins.md).

# Extensions

The Retailys system can be expanded with many other extensions that have an API. 

Currently, we support: 

* Sklik 
* Heureka.cz 
* Zboží.cz 
* Facebook for posting 
* PayPal 
* Comgate 
* Shipment 
* Google Analytics 
* Toplist.cz 
* EET 
* iDoklad 
* UOL 
* Smartsupp

{% hint style="info" %}
Tip: If you would like to create your own extensions, you can use our developer help and use the REST API to develop your add-ons yourself. Don't forget to contact us so we can make your app an official extension.
{% endhint %}