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.
UNDOCUMENTEDPOSTReportClientError
https://api.steampowered.com/IClientMetricsService/ReportClientError/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
string No
string No
CClientMetrics_ReportClientError_Notification.Error[] No
string No
string No
uint32 No
string No
string[] No
UNDOCUMENTEDPOSTReportReactUsage
https://api.steampowered.com/IClientMetricsService/ReportReactUsage/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
string No
string No
CClientMetrics_ReportReactUsage_Notification.RouteData[] No
string No
uint32 No
CClientMetrics_ReportReactUsage_Notification.ComponentData[] No
string No
uint32 No
CClientMetrics_ReportReactUsage_Notification.ActionData[] No
string No
uint32 No