{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "eventType": {
      "type": "string"
    },
    "payload": {
      "type": "object",
      "properties": {
        "sessionId": {
          "type": "string"
        },
        "url": {
          "type": "string"
        }
      },
      "required": [
        "sessionId",
        "url"
      ]
    }
  },
  "required": [
    "eventType",
    "payload"
  ]
}