Check out the JavaScript SDK if you wish to control the session from the frontend.

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Base URL

The base URL (referred to as base_url in examples) is the session’s embed URL with the query parameters removed. For example, given this response from POST /vm: 
{
  "session_id": "52f968cb-6739-4197-83d7-2305fe5d6f54",
  "embed_url": "https://vwdrccwgpv181powg61ggyvy.hyperbeam.com/Uvloy2c5QZeD1yMF_l1vVA?token=c8iw3SmQglOU0ugfLr3dWY2LalSKI_WOGUldEt8knbw",
  "admin_token": "51JOZEEcMp4trCwbpTS3jjQc0lSmeAZpPfxioDqe73U"
}
The base_url value would be: 
https://vwdrccwgpv181powg61ggyvy.hyperbeam.com/Uvloy2c5QZeD1yMF_l1vVA

​
Authentication

To authenticate, provide the session’s admin token as a bearer token in the Authorization header. For example: 
curl -X POST \
    -H 'Authorization: Bearer 51JOZEEcMp4trCwbpTS3jjQc0lSmeAZpPfxioDqe73U' \
    https://vwdrccwgpv181powg61ggyvy.hyperbeam.com/Uvloy2c5QZeD1yMF_l1vVA/tabs.update
    -d '[1, {"active": true}]'