This is the shared collector for the whole pack. Every out-of-band callback your payloads make — across all mini-labs — lands here with its unique id and a timestamp, the same job XSS Hunter or interactsh would do in the real world. Match the returning id back to the field you tagged it with.
Auto-refreshes every 5s.
/m04-p/collector?id=<id> into one of the inputs, then wait a few seconds for the staff bot to open the dashboard.