json_schema: {
      "definitions": {
          "user_subscription": {
              "additionalProperties": false,
              "anyOf": [
                  {
                      "required": [
                          "list_id"
                      ],
                      "title": "Required list_id"
                  },
                  {
                      "required": [
                          "list_code"
                      ],
                      "title": "Required list_code"
                  }
              ],
              "properties": {
                  "email": {
                      "format": "email",
                      "type": "string"
                  },
                  "list_code": {
                      "type": "string"
                  },
                  "list_id": {
                      "type": "integer"
                  },
                  "subscribe": {
                      "type": "boolean"
                  },
                  "user_id": {
                      "type": "integer"
                  },
                  "utm_params": {
                      "type": "object"
                  },
                  "variant_id": {
                      "type": "integer"
                  }
              },
              "required": [
                  "email",
                  "user_id",
                  "subscribe"
              ],
              "type": "object"
          }
      },
      "description": "Subscribe user",
      "properties": {
          "users": {
              "items": {
                  "$ref": "#/definitions/user_subscription"
              },
              "type": "array"
          }
      },
      "required": [
          "users"
      ],
      "title": "Bulk Subscribe",
      "type": "object"
  }