curl --request POST \
  --url https://apigw.ipxo.com/billing/v1/{tenantUUID}/cart/items \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "product_type": "ipv4",
  "billing_cycle": 0,
  "label": "string",
  "product_options": {
    "quantity": {
      "<key1>": 0,
      "<key2>": 0,
      "<key..>": 0,
      "<keyN>": 0
    },
    "selection": {
      "<key1>": "string",
      "<key2>": "string",
      "<key..>": "string",
      "<keyN>": "string"
    }
  },
  "product_fields": {
    "<key1>": {},
    "<key2>": {},
    "<key..>": {},
    "<keyN>": {},
    "aws_account_id": "123456789012",
    "aws_service": "EC2",
    "aws_region": "us-east-1"
  }
}
'

import requests

url = "https://apigw.ipxo.com/billing/v1/{tenantUUID}/cart/items"

payload = {
    "product_type": "ipv4",
    "billing_cycle": 0,
    "label": "string",
    "product_options": {
        "quantity": {
            "<key1>": 0,
            "<key2>": 0,
            "<key..>": 0,
            "<keyN>": 0
        },
        "selection": {
            "<key1>": "string",
            "<key2>": "string",
            "<key..>": "string",
            "<keyN>": "string"
        }
    },
    "product_fields": {
        "<key1>": {},
        "<key2>": {},
        "<key..>": {},
        "<keyN>": {},
        "aws_account_id": "123456789012",
        "aws_service": "EC2",
        "aws_region": "us-east-1"
    }
}
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({
    product_type: 'ipv4',
    billing_cycle: 0,
    label: 'string',
    product_options: {
      quantity: {'<key1>': 0, '<key2>': 0, '<key..>': 0, '<keyN>': 0},
      selection: {
        '<key1>': 'string',
        '<key2>': 'string',
        '<key..>': 'string',
        '<keyN>': 'string'
      }
    },
    product_fields: {
      '<key1>': {},
      '<key2>': {},
      '<key..>': {},
      '<keyN>': {},
      aws_account_id: '123456789012',
      aws_service: 'EC2',
      aws_region: 'us-east-1'
    }
  })
};

fetch('https://apigw.ipxo.com/billing/v1/{tenantUUID}/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://apigw.ipxo.com/billing/v1/{tenantUUID}/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([
    'product_type' => 'ipv4',
    'billing_cycle' => 0,
    'label' => 'string',
    'product_options' => [
        'quantity' => [
                '<key1>' => 0,
                '<key2>' => 0,
                '<key..>' => 0,
                '<keyN>' => 0
        ],
        'selection' => [
                '<key1>' => 'string',
                '<key2>' => 'string',
                '<key..>' => 'string',
                '<keyN>' => 'string'
        ]
    ],
    'product_fields' => [
        '<key1>' => [
                
        ],
        '<key2>' => [
                
        ],
        '<key..>' => [
                
        ],
        '<keyN>' => [
                
        ],
        'aws_account_id' => '123456789012',
        'aws_service' => 'EC2',
        'aws_region' => 'us-east-1'
    ]
  ]),
  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://apigw.ipxo.com/billing/v1/{tenantUUID}/cart/items"

	payload := strings.NewReader("{\n  \"product_type\": \"ipv4\",\n  \"billing_cycle\": 0,\n  \"label\": \"string\",\n  \"product_options\": {\n    \"quantity\": {\n      \"<key1>\": 0,\n      \"<key2>\": 0,\n      \"<key..>\": 0,\n      \"<keyN>\": 0\n    },\n    \"selection\": {\n      \"<key1>\": \"string\",\n      \"<key2>\": \"string\",\n      \"<key..>\": \"string\",\n      \"<keyN>\": \"string\"\n    }\n  },\n  \"product_fields\": {\n    \"<key1>\": {},\n    \"<key2>\": {},\n    \"<key..>\": {},\n    \"<keyN>\": {},\n    \"aws_account_id\": \"123456789012\",\n    \"aws_service\": \"EC2\",\n    \"aws_region\": \"us-east-1\"\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://apigw.ipxo.com/billing/v1/{tenantUUID}/cart/items")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"product_type\": \"ipv4\",\n  \"billing_cycle\": 0,\n  \"label\": \"string\",\n  \"product_options\": {\n    \"quantity\": {\n      \"<key1>\": 0,\n      \"<key2>\": 0,\n      \"<key..>\": 0,\n      \"<keyN>\": 0\n    },\n    \"selection\": {\n      \"<key1>\": \"string\",\n      \"<key2>\": \"string\",\n      \"<key..>\": \"string\",\n      \"<keyN>\": \"string\"\n    }\n  },\n  \"product_fields\": {\n    \"<key1>\": {},\n    \"<key2>\": {},\n    \"<key..>\": {},\n    \"<keyN>\": {},\n    \"aws_account_id\": \"123456789012\",\n    \"aws_service\": \"EC2\",\n    \"aws_region\": \"us-east-1\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://apigw.ipxo.com/billing/v1/{tenantUUID}/cart/items")

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  \"product_type\": \"ipv4\",\n  \"billing_cycle\": 0,\n  \"label\": \"string\",\n  \"product_options\": {\n    \"quantity\": {\n      \"<key1>\": 0,\n      \"<key2>\": 0,\n      \"<key..>\": 0,\n      \"<keyN>\": 0\n    },\n    \"selection\": {\n      \"<key1>\": \"string\",\n      \"<key2>\": \"string\",\n      \"<key..>\": \"string\",\n      \"<keyN>\": \"string\"\n    }\n  },\n  \"product_fields\": {\n    \"<key1>\": {},\n    \"<key2>\": {},\n    \"<key..>\": {},\n    \"<keyN>\": {},\n    \"aws_account_id\": \"123456789012\",\n    \"aws_service\": \"EC2\",\n    \"aws_region\": \"us-east-1\"\n  }\n}"

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