Tell Craft that the widget was opened, or submitted, on your page.

Fire and forget. 202 with no body, and the body means nothing beyond "received". Do not retry it, do not wait for it before showing your form, and never let it fail a submission — a relay that breaks the thing it measures is worse than no measurement.

What to send. eventName is beWidgetOpened (the form was shown to somebody) or beWidgetSubmitted. Everything else is optional context about the page:

{ "eventName": "beWidgetOpened", "widgetVersion": "v1",
  "browser": "<navigator.userAgent>", "mobile": false, "categoriesSize": 3 }

portalId and widgetId may also be sent and must then match the path, which is what counts.

Nothing about the person reaches Craft through this endpoint — no page URL, nothing typed into the form, no identity. An unlisted property is a 422 rather than a silent drop, so a typo is something you see on your first attempt instead of a series that never arrives.

Takes the same three credentials as the config read: a widget token, a development key, or an account API key.