The Shoper allows applications registered in the Appstore to be displayed in the store's administration panel via an iframe. AppstoreBundle has a configured JS SDK Shoper loading code as well as an iframe initiating code and Aurora styles, more information about JS SDK can be found in developers.shoper.pl documentation
To use the TWIG template provided by AppstoreBundle in the main TWIG file of your project, attach:
{% include '@Appstore/js_sdk.html.twig' %}