Example response:

{
  "data": {
    "shipping_groups": [
      {
        "id": 1,
        "name": "T-shirts",
        "products": [
          1,
          2,
          3
        ],
        "shipping_rates": [
          {
            "shipping_rate": {
              "shipping_class_id": 1,
              "first_item_in_cents": 450,
              "additional_item_in_cents": 150
            }
          }
        ]
      }
    ]
  },
  "meta": {
    "code": 200,
    "api_version": "1.0"
  }
}