If you'd like to add additional custom information (coordinates, room number, etc.) for the recipient of an API request, you can easily add this in the setting-page for your device or building.
Devices
Navigate to your device, tab Settings, and open Custom labels
Add your custom labels and click Save changes to register the labels.
The labels will now be presented in the /segments endpoint in the API.
Buildings
Navigate to "Buildings" on the left-hand menu and select the building you want to create labels for. Go to the tab Settings, and open Custom labels
Add your custom labels and click Save to register the labels.
The labels will now be presented in the /locations endpoint in the API.