curl --request POST \
  --url https://api.atlas.kitchen/storefronts/v1/cart \
  --header 'X-Channel-Id: <api-key>'

{
  "id": 123,
  "channel_id": 123,
  "outlet_id": 123,
  "brand_id": 123,
  "user_id": 123,
  "timeslot_start": 123,
  "timeslot_end": 123,
  "timeslot_type": "asap",
  "timeslot_range": "<string>",
  "fulfilment_type": "delivery",
  "serving_date": "2023-12-25",
  "contact_name": "<string>",
  "contact_email": "<string>",
  "contact_number": "<string>",
  "address_line1": "<string>",
  "address_line2": "<string>",
  "address_latitude": 123,
  "address_longitude": 123,
  "postal_code": "<string>",
  "notes": "<string>",
  "is_gift": true,
  "recipient_name": "<string>",
  "recipient_contact_number": "<string>",
  "gift_message": "<string>",
  "promo_code": "<string>",
  "is_checked_out": true,
  "use_points": true,
  "brand": {
    "name": "<string>"
  },
  "cart_items": [
    {
      "id": 123,
      "item_id": 123,
      "name": "<string>",
      "quantity": 123,
      "price_cents": 123,
      "calculated_subtotal": 123,
      "per_unit_quantity": 123,
      "unit_label": "<string>",
      "notes": "<string>",
      "modifier_id": 123,
      "item_modifier_group_id": 123,
      "sub_items": [
        {
          "item_id": 123,
          "name": "<string>",
          "quantity": 123,
          "price_cents": 123,
          "calculated_subtotal": 123,
          "per_unit_quantity": 123,
          "unit_label": "<string>",
          "notes": "<string>",
          "modifier_id": 123,
          "item_modifier_group_id": 123,
          "sub_items": "<array>"
        }
      ]
    }
  ]
}