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.
Navigate to your device, click the pencil-icon in the top right corner and click "Edit device".
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.
Navigate to "Buildings" on the left hand menu and select the location you want to create labels for.
Add your custom labels and click "Save " to register the labels.
The labels will now be presented in the /locations endpoint in the API.