{
  "id": "sale.sync",
  "type": "object",
  "additionalProperties": false,
  "required": ["data"],
  "properties": {
    "data": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "type", "attributes"],
      "properties": {
        "type": {
          "type": "string",
          "constant": "sale"
        },
        "attributes": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "next_id": { "type": "string", "minLength": 1 }
          }
        }
      }
    }
  }
}