modal.js

const createUrl = async () => {
  const context = await client.instance.context()
  const service_user_id = `service_user_${context.data.ticketCreatorData.contact.id}`
  const data = await client.request.invoke("buildBackupGroupCallUrl", {userId:   
   service_user_id} )
  /* Modal of returned data.response.
  {
    "service_user_id": "service_user_150006383534",
    "room_id": "b1650746-e810-4aeb-ae2a-422d8a42523c",
    "app_id": "YOUR_APP_ID",
    "creds": {
      "token": "SOME_SENDBIRD_SESSION_TOKEN",
      "expires_at": 1672902388000
      }
  }
  */
    roomId = data.response.room_id
    const url = `http://localhost:1234/?data=${btoa(JSON.stringify(data.response))}`
    document.getElementById('link').innerHTML = url
}