curl --request POST \
  --url https://api.example.test/item_transactions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "item_transaction": {
    "quantity": 123,
    "metadata": {
      "account_email": "jsmith@example.com",
      "account_name": "<string>",
      "invoice_item_description": "<string>"
    },
    "account_id": "<string>",
    "location_id": "<string>",
    "invoice_item_id": "<string>"
  }
}
'

import requests

url = "https://api.example.test/item_transactions"

payload = { "item_transaction": {
        "quantity": 123,
        "metadata": {
            "account_email": "jsmith@example.com",
            "account_name": "<string>",
            "invoice_item_description": "<string>"
        },
        "account_id": "<string>",
        "location_id": "<string>",
        "invoice_item_id": "<string>"
    } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    item_transaction: {
      quantity: 123,
      metadata: {
        account_email: 'jsmith@example.com',
        account_name: '<string>',
        invoice_item_description: '<string>'
      },
      account_id: '<string>',
      location_id: '<string>',
      invoice_item_id: '<string>'
    }
  })
};

fetch('https://api.example.test/item_transactions', 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.example.test/item_transactions",
  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_transaction' => [
        'quantity' => 123,
        'metadata' => [
                'account_email' => 'jsmith@example.com',
                'account_name' => '<string>',
                'invoice_item_description' => '<string>'
        ],
        'account_id' => '<string>',
        'location_id' => '<string>',
        'invoice_item_id' => '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "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 := "https://api.example.test/item_transactions"

	payload := strings.NewReader("{\n  \"item_transaction\": {\n    \"quantity\": 123,\n    \"metadata\": {\n      \"account_email\": \"jsmith@example.com\",\n      \"account_name\": \"<string>\",\n      \"invoice_item_description\": \"<string>\"\n    },\n    \"account_id\": \"<string>\",\n    \"location_id\": \"<string>\",\n    \"invoice_item_id\": \"<string>\"\n  }\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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.example.test/item_transactions")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"item_transaction\": {\n    \"quantity\": 123,\n    \"metadata\": {\n      \"account_email\": \"jsmith@example.com\",\n      \"account_name\": \"<string>\",\n      \"invoice_item_description\": \"<string>\"\n    },\n    \"account_id\": \"<string>\",\n    \"location_id\": \"<string>\",\n    \"invoice_item_id\": \"<string>\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.test/item_transactions")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"item_transaction\": {\n    \"quantity\": 123,\n    \"metadata\": {\n      \"account_email\": \"jsmith@example.com\",\n      \"account_name\": \"<string>\",\n      \"invoice_item_description\": \"<string>\"\n    },\n    \"account_id\": \"<string>\",\n    \"location_id\": \"<string>\",\n    \"invoice_item_id\": \"<string>\"\n  }\n}"

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

{
  "item_transaction": {
    "id": 123,
    "account_id": 123,
    "invoice_item_id": 123,
    "metadata": {
      "account_email": "jsmith@example.com",
      "account_name": "<string>",
      "invoice_item_description": "<string>"
    },
    "quantity": 123
  }
}