{
    "id1-1": "Usermail.com",
    "id2-1": "Usermail.com",
    "id3-1": "Usermail.com",

    "products": [
      {
        "product_type": "material",
        "material_id": 123,
        "quantity": 10,
        "warehouse_id": -321
      },

      {
        "product_type": "service",
        "name": "",
        "extra_field": "some data"
      }
    ]
}