Create a Shipping Method

curl --request POST \
  --url http://{defaultHost}/api/v2/platform/shipping_methods \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "shipping_method": {
    "name": "DHL Express",
    "admin_name": "DHL Area Code D",
    "code": "DHL-A-D",
    "tracking_url": "dhlexpress.com?tracking=",
    "display_on": "both",
    "tax_category_id": "1",
    "shipping_category_ids": [
      "2"
    ],
    "calculator_attributes": {
      "type": "Spree::Calculator::Shipping::FlatPercentItemTotal"
    },
    "public_metadata": {},
    "private_metadata": {}
  }
}'

{
  "data": {
    "id": "81",
    "type": "shipping_method",
    "attributes": {
      "name": "DHL Express Domestic",
      "code": "DDD",
      "admin_name": "DHL Express- Zone A",
      "display_on": "both",
      "tracking_url": null,
      "created_at": "2022-11-08T19:35:24.485Z",
      "updated_at": "2022-11-08T19:35:24.485Z",
      "deleted_at": null,
      "public_metadata": {},
      "private_metadata": {}
    },
    "relationships": {
      "shipping_categories": {
        "data": [
          {
            "id": "148",
            "type": "shipping_category"
          }
        ]
      },
      "shipping_rates": {
        "data": []
      },
      "tax_category": {
        "data": {
          "id": "142",
          "type": "tax_category"
        }
      },
      "calculator": {
        "data": {
          "id": "141",
          "type": "calculator"
        }
      }
    }
  }
}