[xwiki-users] Script macros via RESTful API?

Hi, Noob question... We're using the RESTful API to embed our XWiki content in an external HTML page. I'm wondering whether there's an easy way to still use velocity macros (or any basic script macros) via the RESTful API or does this require including additional uicomponent javascript/css files in the external HTML page? Have been trying to find documentation on this but can't seem to. The macros display fine on the XWiki pages but the external HTML page says: The "gallery" macro is not in the list of registered macros. Verify the spelling or contact your administrator. Thanks, Eva