This page is just a reference of all the known Steam APIs, I do not know how they work. Please do not email me with questions.
UNDOCUMENTEDAddVRDeviceInfo

Adds a device to the VRDeviceInfo table for the hardware survey

https://api.steampowered.com/IDataPublisherService/AddVRDeviceInfo/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
string NoManufacturer for the new device
string NoModel for the new device
string Nodriver name (not including driver_). e.g. lighthouse, oculus, holographic
string Nocontroller type for the device. Can be an empty string for devices with no inputs
int32 NoClass of the device. HMD=1, controller=2, tracker=3, base=4
UNDOCUMENTEDGetVRDeviceInfo

Generate a debug report of what devices are in the survey

https://api.steampowered.com/IDataPublisherService/GetVRDeviceInfo/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
uint32 NoNumber of months for which to generate a report

Set the rollup reference of a single VR device

https://api.steampowered.com/IDataPublisherService/SetVRDeviceInfoAggregationReference/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
uint32 NoReference number in the VRDeviceInfo table for the entry to set
uint32 NoAggregation to set the entry to