curl --request POST \
  --url 'https://api.stateset.com/api/v1/carts/{id}/shipping' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "shipping_address": {
    "city": "string",
    "company": null,
    "country": "string",
    "email": null,
    "first_name": null,
    "last_name": null,
    "line1": "string",
    "line2": null,
    "phone": null,
    "postal_code": "string",
    "state": null
  },
  "shipping_amount": null,
  "shipping_carrier": null,
  "shipping_method": null
}'

{
  "cart_number": "string",
  "created_at": "string",
  "currency": "string",
  "customer_email": null,
  "customer_id": null,
  "discount_amount": "string",
  "grand_total": "string",
  "id": "string",
  "items": [
    {
      "discount_amount": "string",
      "id": "string",
      "name": "string",
      "product_id": null,
      "quantity": 1,
      "sku": "string",
      "total": "string",
      "unit_price": "string"
    }
  ],
  "order_id": null,
  "order_number": null,
  "payment_method": null,
  "shipping_amount": "string",
  "shipping_method": null,
  "status": "string",
  "subtotal": "string",
  "tax_amount": "string"
}