curl --request POST \
  --url https://merchant-url.com/api/order_create \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "event": "order.create",
  "data": {
    "order": {
      "token": "a2b3dDc4cA5e6fg78Bg9hj0kl",
      "user_note": "This item is a gift.",
      "external_data": {
        "shopify": "VIP shopper"
      },
      "dynamic_content": {
        "shipping_info_notice": "A Notice Message",
        "payment_notice": "A Notice Message",
        "shipping_notice": "A Notice Message",
        "order_notice": "A Notice Message",
        "custom_fields": [
          {
            "external_id": "123456",
            "public_id": "i-123456",
            "label": "Special Field",
            "field_setup": "string",
            "checkout_setup": "string",
            "position": 1,
            "required": true,
            "dynamic": false,
            "subscribe_to_newsletter": false
          }
        ],
        "hide_apm": [],
        "gift_option_view": {
          "hide_gift_wrap": false,
          "hide_gift_message": false
        }
      }
    },
    "currency": "USD",
    "metadata": {
      "key1": "value1",
      "key2": "value2"
    }
  }
}
'

import requests

url = "https://merchant-url.com/api/order_create"

payload = {
    "event": "order.create",
    "data": {
        "order": {
            "token": "a2b3dDc4cA5e6fg78Bg9hj0kl",
            "user_note": "This item is a gift.",
            "external_data": { "shopify": "VIP shopper" },
            "dynamic_content": {
                "shipping_info_notice": "A Notice Message",
                "payment_notice": "A Notice Message",
                "shipping_notice": "A Notice Message",
                "order_notice": "A Notice Message",
                "custom_fields": [
                    {
                        "external_id": "123456",
                        "public_id": "i-123456",
                        "label": "Special Field",
                        "field_setup": "string",
                        "checkout_setup": "string",
                        "position": 1,
                        "required": True,
                        "dynamic": False,
                        "subscribe_to_newsletter": False
                    }
                ],
                "hide_apm": [],
                "gift_option_view": {
                    "hide_gift_wrap": False,
                    "hide_gift_message": False
                }
            }
        },
        "currency": "USD",
        "metadata": {
            "key1": "value1",
            "key2": "value2"
        }
    }
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    event: 'order.create',
    data: {
      order: {
        token: 'a2b3dDc4cA5e6fg78Bg9hj0kl',
        user_note: 'This item is a gift.',
        external_data: {shopify: 'VIP shopper'},
        dynamic_content: {
          shipping_info_notice: 'A Notice Message',
          payment_notice: 'A Notice Message',
          shipping_notice: 'A Notice Message',
          order_notice: 'A Notice Message',
          custom_fields: [
            {
              external_id: '123456',
              public_id: 'i-123456',
              label: 'Special Field',
              field_setup: 'string',
              checkout_setup: 'string',
              position: 1,
              required: true,
              dynamic: false,
              subscribe_to_newsletter: false
            }
          ],
          hide_apm: [],
          gift_option_view: {hide_gift_wrap: false, hide_gift_message: false}
        }
      },
      currency: 'USD',
      metadata: {key1: 'value1', key2: 'value2'}
    }
  })
};

fetch('https://merchant-url.com/api/order_create', 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://merchant-url.com/api/order_create",
  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([
    'event' => 'order.create',
    'data' => [
        'order' => [
                'token' => 'a2b3dDc4cA5e6fg78Bg9hj0kl',
                'user_note' => 'This item is a gift.',
                'external_data' => [
                                'shopify' => 'VIP shopper'
                ],
                'dynamic_content' => [
                                'shipping_info_notice' => 'A Notice Message',
                                'payment_notice' => 'A Notice Message',
                                'shipping_notice' => 'A Notice Message',
                                'order_notice' => 'A Notice Message',
                                'custom_fields' => [
                                                                [
                                                                                                                                'external_id' => '123456',
                                                                                                                                'public_id' => 'i-123456',
                                                                                                                                'label' => 'Special Field',
                                                                                                                                'field_setup' => 'string',
                                                                                                                                'checkout_setup' => 'string',
                                                                                                                                'position' => 1,
                                                                                                                                'required' => true,
                                                                                                                                'dynamic' => false,
                                                                                                                                'subscribe_to_newsletter' => false
                                                                ]
                                ],
                                'hide_apm' => [
                                                                
                                ],
                                'gift_option_view' => [
                                                                'hide_gift_wrap' => false,
                                                                'hide_gift_message' => false
                                ]
                ]
        ],
        'currency' => 'USD',
        'metadata' => [
                'key1' => 'value1',
                'key2' => 'value2'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <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://merchant-url.com/api/order_create"

	payload := strings.NewReader("{\n  \"event\": \"order.create\",\n  \"data\": {\n    \"order\": {\n      \"token\": \"a2b3dDc4cA5e6fg78Bg9hj0kl\",\n      \"user_note\": \"This item is a gift.\",\n      \"external_data\": {\n        \"shopify\": \"VIP shopper\"\n      },\n      \"dynamic_content\": {\n        \"shipping_info_notice\": \"A Notice Message\",\n        \"payment_notice\": \"A Notice Message\",\n        \"shipping_notice\": \"A Notice Message\",\n        \"order_notice\": \"A Notice Message\",\n        \"custom_fields\": [\n          {\n            \"external_id\": \"123456\",\n            \"public_id\": \"i-123456\",\n            \"label\": \"Special Field\",\n            \"field_setup\": \"string\",\n            \"checkout_setup\": \"string\",\n            \"position\": 1,\n            \"required\": true,\n            \"dynamic\": false,\n            \"subscribe_to_newsletter\": false\n          }\n        ],\n        \"hide_apm\": [],\n        \"gift_option_view\": {\n          \"hide_gift_wrap\": false,\n          \"hide_gift_message\": false\n        }\n      }\n    },\n    \"currency\": \"USD\",\n    \"metadata\": {\n      \"key1\": \"value1\",\n      \"key2\": \"value2\"\n    }\n  }\n}")

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

	req.Header.Add("X-API-Key", "<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://merchant-url.com/api/order_create")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"event\": \"order.create\",\n  \"data\": {\n    \"order\": {\n      \"token\": \"a2b3dDc4cA5e6fg78Bg9hj0kl\",\n      \"user_note\": \"This item is a gift.\",\n      \"external_data\": {\n        \"shopify\": \"VIP shopper\"\n      },\n      \"dynamic_content\": {\n        \"shipping_info_notice\": \"A Notice Message\",\n        \"payment_notice\": \"A Notice Message\",\n        \"shipping_notice\": \"A Notice Message\",\n        \"order_notice\": \"A Notice Message\",\n        \"custom_fields\": [\n          {\n            \"external_id\": \"123456\",\n            \"public_id\": \"i-123456\",\n            \"label\": \"Special Field\",\n            \"field_setup\": \"string\",\n            \"checkout_setup\": \"string\",\n            \"position\": 1,\n            \"required\": true,\n            \"dynamic\": false,\n            \"subscribe_to_newsletter\": false\n          }\n        ],\n        \"hide_apm\": [],\n        \"gift_option_view\": {\n          \"hide_gift_wrap\": false,\n          \"hide_gift_message\": false\n        }\n      }\n    },\n    \"currency\": \"USD\",\n    \"metadata\": {\n      \"key1\": \"value1\",\n      \"key2\": \"value2\"\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://merchant-url.com/api/order_create")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"event\": \"order.create\",\n  \"data\": {\n    \"order\": {\n      \"token\": \"a2b3dDc4cA5e6fg78Bg9hj0kl\",\n      \"user_note\": \"This item is a gift.\",\n      \"external_data\": {\n        \"shopify\": \"VIP shopper\"\n      },\n      \"dynamic_content\": {\n        \"shipping_info_notice\": \"A Notice Message\",\n        \"payment_notice\": \"A Notice Message\",\n        \"shipping_notice\": \"A Notice Message\",\n        \"order_notice\": \"A Notice Message\",\n        \"custom_fields\": [\n          {\n            \"external_id\": \"123456\",\n            \"public_id\": \"i-123456\",\n            \"label\": \"Special Field\",\n            \"field_setup\": \"string\",\n            \"checkout_setup\": \"string\",\n            \"position\": 1,\n            \"required\": true,\n            \"dynamic\": false,\n            \"subscribe_to_newsletter\": false\n          }\n        ],\n        \"hide_apm\": [],\n        \"gift_option_view\": {\n          \"hide_gift_wrap\": false,\n          \"hide_gift_message\": false\n        }\n      }\n    },\n    \"currency\": \"USD\",\n    \"metadata\": {\n      \"key1\": \"value1\",\n      \"key2\": \"value2\"\n    }\n  }\n}"

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

{
  "event": "order.create",
  "status": "success",
  "data": {
    "display_id": "ID-12345",
    "order_received_url": "https://***.com/confirmation/O-100104040"
  }
}

{
  "status": "failure",
  "errors": [
    {
      "code": 2001005,
      "data": [
        {
          "reason": "This product is out of stock."
        }
      ]
    }
  ]
}