# 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 %}


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```
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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.