You can attach metadata to your real-time transcription session using the custom_metadata property. This makes it easy to recognize your transcription when you receive data from the GET /v2/live/:id endpoint, and enables filtering in the GET /v2/live list endpoint. For example, add the following to your configuration: 
"custom_metadata": {
  "internalUserId": 2348739875894375,
  "paymentMethod": {
    "last4Digits": 4576
  },
  "internalUserName": "Spencer"
}
Then filter results with a GET request, like: 
https://api.gladia.io/v2/live?custom_metadata={"internalUserId": "2348739875894375"}
or: 
https://api.gladia.io/v2/live?custom_metadata={"paymentMethod": {"last4Digits": 4576}, "internalUserName": "Spencer"}
custom_metadata cannot be longer than 2000 characters when stringified.