curl --request POST \
  --url {protocol}://{host}/wp-json/cocart/v2/cart/add-items \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "id": "<string>",
      "quantity": "1",
      "variation": {},
      "item_data": {}
    }
  ],
  "email": "jsmith@example.com",
  "phone": "<string>",
  "return_items": false
}
'

import requests

url = "{protocol}://{host}/wp-json/cocart/v2/cart/add-items"

payload = {
    "items": [
        {
            "id": "<string>",
            "quantity": "1",
            "variation": {},
            "item_data": {}
        }
    ],
    "email": "jsmith@example.com",
    "phone": "<string>",
    "return_items": False
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    items: [{id: '<string>', quantity: '1', variation: {}, item_data: {}}],
    email: 'jsmith@example.com',
    phone: '<string>',
    return_items: false
  })
};

fetch('{protocol}://{host}/wp-json/cocart/v2/cart/add-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 => "{protocol}://{host}/wp-json/cocart/v2/cart/add-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([
    'items' => [
        [
                'id' => '<string>',
                'quantity' => '1',
                'variation' => [
                                
                ],
                'item_data' => [
                                
                ]
        ]
    ],
    'email' => 'jsmith@example.com',
    'phone' => '<string>',
    'return_items' => false
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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 := "{protocol}://{host}/wp-json/cocart/v2/cart/add-items"

	payload := strings.NewReader("{\n  \"items\": [\n    {\n      \"id\": \"<string>\",\n      \"quantity\": \"1\",\n      \"variation\": {},\n      \"item_data\": {}\n    }\n  ],\n  \"email\": \"jsmith@example.com\",\n  \"phone\": \"<string>\",\n  \"return_items\": false\n}")

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

	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("{protocol}://{host}/wp-json/cocart/v2/cart/add-items")
  .header("Content-Type", "application/json")
  .body("{\n  \"items\": [\n    {\n      \"id\": \"<string>\",\n      \"quantity\": \"1\",\n      \"variation\": {},\n      \"item_data\": {}\n    }\n  ],\n  \"email\": \"jsmith@example.com\",\n  \"phone\": \"<string>\",\n  \"return_items\": false\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("{protocol}://{host}/wp-json/cocart/v2/cart/add-items")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"items\": [\n    {\n      \"id\": \"<string>\",\n      \"quantity\": \"1\",\n      \"variation\": {},\n      \"item_data\": {}\n    }\n  ],\n  \"email\": \"jsmith@example.com\",\n  \"phone\": \"<string>\",\n  \"return_items\": false\n}"

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

[
  {
    "item_key": "<string>",
    "id": 123,
    "name": "<string>",
    "title": "<string>",
    "price": "<string>",
    "quantity": {
      "value": 123,
      "min_purchase": 123,
      "max_purchase": 123
    },
    "totals": {
      "subtotal": 123,
      "subtotal_tax": 123,
      "total": 123,
      "tax": 123
    },
    "slug": "<string>",
    "meta": {
      "product_type": "<string>",
      "sku": "<string>",
      "dimensions": {
        "length": "<string>",
        "width": "<string>",
        "height": "<string>",
        "unit": "<string>"
      },
      "weight": "<string>",
      "variation": {}
    },
    "backorders": "<string>",
    "cart_item_data": {},
    "featured_image": "<string>"
  }
]

{
  "code": "cocart_invalid_items",
  "message": "Invalid items array provided.",
  "data": {
    "status": 400
  }
}

{
  "code": "cocart_cannot_add_items",
  "message": "One or more products cannot be added to the cart.",
  "data": {
    "status": 403
  }
}