curl --request POST \
  --url https://api.atlas.kitchen/storefronts/v1/cart/items \
  --header 'Content-Type: application/json' \
  --header 'X-Channel-Id: <api-key>' \
  --header 'X-Session-Id: <api-key>' \
  --data '
{
  "item_id": 123,
  "quantity": 2,
  "notes": "<string>",
  "sub_items": [
    {
      "item_id": 123,
      "modifier_id": 123,
      "item_modifier_group_id": 123,
      "quantity": 2
    }
  ]
}
'

import requests

url = "https://api.atlas.kitchen/storefronts/v1/cart/items"

payload = {
    "item_id": 123,
    "quantity": 2,
    "notes": "<string>",
    "sub_items": [
        {
            "item_id": 123,
            "modifier_id": 123,
            "item_modifier_group_id": 123,
            "quantity": 2
        }
    ]
}
headers = {
    "X-Channel-Id": "<api-key>",
    "X-Session-Id": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-Channel-Id': '<api-key>',
    'X-Session-Id': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    item_id: 123,
    quantity: 2,
    notes: '<string>',
    sub_items: [{item_id: 123, modifier_id: 123, item_modifier_group_id: 123, quantity: 2}]
  })
};

fetch('https://api.atlas.kitchen/storefronts/v1/cart/items', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.atlas.kitchen/storefronts/v1/cart/items",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'item_id' => 123,
    'quantity' => 2,
    'notes' => '<string>',
    'sub_items' => [
        [
                'item_id' => 123,
                'modifier_id' => 123,
                'item_modifier_group_id' => 123,
                'quantity' => 2
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-Channel-Id: <api-key>",
    "X-Session-Id: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.atlas.kitchen/storefronts/v1/cart/items"

	payload := strings.NewReader("{\n  \"item_id\": 123,\n  \"quantity\": 2,\n  \"notes\": \"<string>\",\n  \"sub_items\": [\n    {\n      \"item_id\": 123,\n      \"modifier_id\": 123,\n      \"item_modifier_group_id\": 123,\n      \"quantity\": 2\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-Channel-Id", "<api-key>")
	req.Header.Add("X-Session-Id", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.atlas.kitchen/storefronts/v1/cart/items")
  .header("X-Channel-Id", "<api-key>")
  .header("X-Session-Id", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"item_id\": 123,\n  \"quantity\": 2,\n  \"notes\": \"<string>\",\n  \"sub_items\": [\n    {\n      \"item_id\": 123,\n      \"modifier_id\": 123,\n      \"item_modifier_group_id\": 123,\n      \"quantity\": 2\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.atlas.kitchen/storefronts/v1/cart/items")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-Channel-Id"] = '<api-key>'
request["X-Session-Id"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"item_id\": 123,\n  \"quantity\": 2,\n  \"notes\": \"<string>\",\n  \"sub_items\": [\n    {\n      \"item_id\": 123,\n      \"modifier_id\": 123,\n      \"item_modifier_group_id\": 123,\n      \"quantity\": 2\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "id": 1,
  "item_id": 1,
  "name": "Scrambled Eggs Bowl",
  "quantity": 1,
  "price_cents": 790,
  "calculated_subtotal": 840,
  "per_unit_quantity": 1,
  "unit_label": null,
  "notes": "Extra napkins please",
  "modifier_id": null,
  "item_modifier_group_id": null,
  "sub_items": [
    {
      "item_id": 2,
      "name": "Mild",
      "quantity": 1,
      "price_cents": 0,
      "calculated_subtotal": 0,
      "per_unit_quantity": 1,
      "unit_label": null,
      "notes": null,
      "modifier_id": 1,
      "item_modifier_group_id": 1,
      "sub_items": []
    },
    {
      "item_id": 4,
      "name": "Bacon",
      "quantity": 1,
      "price_cents": 0,
      "calculated_subtotal": 0,
      "per_unit_quantity": 1,
      "unit_label": null,
      "notes": null,
      "modifier_id": 3,
      "item_modifier_group_id": 2,
      "sub_items": []
    },
    {
      "item_id": 13,
      "name": "Extra Cheese",
      "quantity": 1,
      "price_cents": 50,
      "calculated_subtotal": 50,
      "per_unit_quantity": 1,
      "unit_label": null,
      "notes": null,
      "modifier_id": 12,
      "item_modifier_group_id": 4,
      "sub_items": []
    }
  ]
}

{
  "type": "Invalid Parameter",
  "message": "<string>",
  "details": [
    {
      "field": "<string>",
      "message": "<string>"
    }
  ]
}