json_schema: {
      "additionalProperties": true,
      "properties": {
          "asm_group_id": {
              "maximum": 32767,
              "minimum": 0,
              "type": "integer"
          },
          "category": {
              "items": {
                  "type": "string"
              },
              "type": [
                  "array",
                  "string"
              ]
          },
          "email": {
              "type": "string"
          },
          "sg_event_id": {
              "type": "string"
          },
          "sg_message_id": {
              "type": "string"
          },
          "smtp-id": {
              "type": "string"
          },
          "timestamp": {
              "_format": "date-time",
              "type": "string"
          }
      },
      "self": {
          "format": "jsonschema",
          "name": "unsubscribe",
          "vendor": "com.sendgrid",
          "version": "1-0-0"
      },
      "type": "object"
  }