Hi,
the combo is WS69 + GW1100
gateway firmware Version: GW1100A_V2.3.4
The integration is via gateway's weather services/custom/Wunderground protocol. Upload interval 300 seconds.
Due to gateway's tech limitations for URL length, the calls go via reverse proxy that adds the API token, but the rest of the payload is unmodified.
When I check the station data or history in windy, the detail view properly shows "latest observation" timestamp — ranges from "now" to 5m ago.