Map an external form block in a flow

On a successfull POST, a websocket message, containing the jsonBody (object), will be sent to the user who called this endpoint.

Sample message:

{
    "type": "flow.externalFormData",
    "message": {
        "payload": {jsonBody},
        "keysHash": "keysHash",
        "referer": "referer"
    }
}