json_schema: {
      "additionalProperties": false,
      "description": "Schema for a Google Analytics enhanced e-commerce promotion action entity",
      "properties": {
          "promotionAction": {
              "enum": [
                  "view",
                  "promo_click",
                  "null"
              ]
          }
      },
      "self": {
          "format": "jsonschema",
          "name": "promotion_action",
          "vendor": "com.google.analytics.measurement-protocol",
          "version": "1-0-0"
      },
      "type": "object"
  }