Event is generated whenever a responder submits a message post the Vouch Submitted step.
"event" : {
  "name" : "vouch.declined",
  "timestamp" : "2021-07-06T10:08:08.683Z",
  "vouch" : {
    "id" : "vvvvvvvvvv",
    "status" : "SUBMITTED | RESPONDED",
    "url" : "https://dev.vouchfor.com/vvvvvvvvvv",
    "admin" : "https://dev.vouchfor.com/admin/vvvvvvvvvv",
    "plays" : 0,
    "externalid": "xxxxxxxx"
  },
  "campaign" : {
    "id" : "cccccccccc",
    "name" : "Happy Customers",
    "url" : "https://dev/vouchfor.com/c/cccccccccc",
    "admin" : "https://dev/vouchfor.com/admin/cccccccccc",
    "externalid": "xxxxxxxx"
  },
  "entity" : {
    "id" : "eeeeeeeeee",
    "name" : "Vouch",
    "url" : "https://vouchfor.com",
    "externalid": "xxxxxxxx"
  },
  "account" : {
    "name" : "David Stirk",
    "email" : "david@vouchfor.com"
  },
  "customer" : {
    "name" : "Vouch",
    "url" : "https://vouchfor.com"
  },
  "contact" : {
    "name" : "Daniel Shein",
    "email" : "daniel@vouchfor.com"
  },
  "message" : {
    "text" : "this is a message from the contact"
  }
}