In addition to headers mentioned elsewhere in the documentation:

Supply to API

Recommended (optional)

X-Client-Private-Ip

The private IP address of the device that the end-user is using.

X-Client-Public-Ip

The public IP address of the device that the end-user is using. Typically to be detected and passed by the server hosting an app. For end-user apps accessing the API directly, detected by Noah ES.

X-Client-Computer-Name

The computer name of the device that the end-user is using.

X-App-Module-Name

The name of the (sub)module running within the app. E.g. an audiogram module.

X-App-Module-Version

The version of the (sub)module running within the app. E.g. an audiogram module.

Optional

X-App-Version

The version of the app.