curl --request POST \
  --url https://api.hel.io/v1/transaction/headless/prepare \
  --header 'Content-Type: application/json' \
  --data '
{
  "paymentRequestId": "<string>",
  "senderPublicKey": "<string>",
  "currencyId": "<string>",
  "quantity": 123,
  "minimalUnitAmount": 123,
  "affiliateCode": "<string>",
  "btcPublicKey": "<string>",
  "customerDetails": {
    "email": "<string>",
    "discordUser": {
      "id": "<string>",
      "username": "<string>"
    },
    "twitterUsername": "<string>",
    "telegramUser": {
      "id": 123,
      "username": "<string>"
    },
    "fullName": "<string>",
    "country": "<string>",
    "state": "<string>",
    "city": "<string>",
    "street": "<string>",
    "streetNumber": "<string>",
    "areaCode": "<string>",
    "deliveryAddress": "<string>",
    "blinkAddress": "<string>",
    "phoneNumber": "<string>",
    "additionalJSON": "<string>",
    "btcProperties": {
      "ordinalsAddress": "<string>"
    }
  },
  "productDetails": {
    "name": "<string>",
    "value": "<string>",
    "active": true
  }
}
'

import requests

url = "https://api.hel.io/v1/transaction/headless/prepare"

payload = {
    "paymentRequestId": "<string>",
    "senderPublicKey": "<string>",
    "currencyId": "<string>",
    "quantity": 123,
    "minimalUnitAmount": 123,
    "affiliateCode": "<string>",
    "btcPublicKey": "<string>",
    "customerDetails": {
        "email": "<string>",
        "discordUser": {
            "id": "<string>",
            "username": "<string>"
        },
        "twitterUsername": "<string>",
        "telegramUser": {
            "id": 123,
            "username": "<string>"
        },
        "fullName": "<string>",
        "country": "<string>",
        "state": "<string>",
        "city": "<string>",
        "street": "<string>",
        "streetNumber": "<string>",
        "areaCode": "<string>",
        "deliveryAddress": "<string>",
        "blinkAddress": "<string>",
        "phoneNumber": "<string>",
        "additionalJSON": "<string>",
        "btcProperties": { "ordinalsAddress": "<string>" }
    },
    "productDetails": {
        "name": "<string>",
        "value": "<string>",
        "active": True
    }
}
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({
    paymentRequestId: '<string>',
    senderPublicKey: '<string>',
    currencyId: '<string>',
    quantity: 123,
    minimalUnitAmount: 123,
    affiliateCode: '<string>',
    btcPublicKey: '<string>',
    customerDetails: {
      email: '<string>',
      discordUser: {id: '<string>', username: '<string>'},
      twitterUsername: '<string>',
      telegramUser: {id: 123, username: '<string>'},
      fullName: '<string>',
      country: '<string>',
      state: '<string>',
      city: '<string>',
      street: '<string>',
      streetNumber: '<string>',
      areaCode: '<string>',
      deliveryAddress: '<string>',
      blinkAddress: '<string>',
      phoneNumber: '<string>',
      additionalJSON: '<string>',
      btcProperties: {ordinalsAddress: '<string>'}
    },
    productDetails: {name: '<string>', value: '<string>', active: true}
  })
};

fetch('https://api.hel.io/v1/transaction/headless/prepare', 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.hel.io/v1/transaction/headless/prepare",
  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([
    'paymentRequestId' => '<string>',
    'senderPublicKey' => '<string>',
    'currencyId' => '<string>',
    'quantity' => 123,
    'minimalUnitAmount' => 123,
    'affiliateCode' => '<string>',
    'btcPublicKey' => '<string>',
    'customerDetails' => [
        'email' => '<string>',
        'discordUser' => [
                'id' => '<string>',
                'username' => '<string>'
        ],
        'twitterUsername' => '<string>',
        'telegramUser' => [
                'id' => 123,
                'username' => '<string>'
        ],
        'fullName' => '<string>',
        'country' => '<string>',
        'state' => '<string>',
        'city' => '<string>',
        'street' => '<string>',
        'streetNumber' => '<string>',
        'areaCode' => '<string>',
        'deliveryAddress' => '<string>',
        'blinkAddress' => '<string>',
        'phoneNumber' => '<string>',
        'additionalJSON' => '<string>',
        'btcProperties' => [
                'ordinalsAddress' => '<string>'
        ]
    ],
    'productDetails' => [
        'name' => '<string>',
        'value' => '<string>',
        'active' => true
    ]
  ]),
  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 := "https://api.hel.io/v1/transaction/headless/prepare"

	payload := strings.NewReader("{\n  \"paymentRequestId\": \"<string>\",\n  \"senderPublicKey\": \"<string>\",\n  \"currencyId\": \"<string>\",\n  \"quantity\": 123,\n  \"minimalUnitAmount\": 123,\n  \"affiliateCode\": \"<string>\",\n  \"btcPublicKey\": \"<string>\",\n  \"customerDetails\": {\n    \"email\": \"<string>\",\n    \"discordUser\": {\n      \"id\": \"<string>\",\n      \"username\": \"<string>\"\n    },\n    \"twitterUsername\": \"<string>\",\n    \"telegramUser\": {\n      \"id\": 123,\n      \"username\": \"<string>\"\n    },\n    \"fullName\": \"<string>\",\n    \"country\": \"<string>\",\n    \"state\": \"<string>\",\n    \"city\": \"<string>\",\n    \"street\": \"<string>\",\n    \"streetNumber\": \"<string>\",\n    \"areaCode\": \"<string>\",\n    \"deliveryAddress\": \"<string>\",\n    \"blinkAddress\": \"<string>\",\n    \"phoneNumber\": \"<string>\",\n    \"additionalJSON\": \"<string>\",\n    \"btcProperties\": {\n      \"ordinalsAddress\": \"<string>\"\n    }\n  },\n  \"productDetails\": {\n    \"name\": \"<string>\",\n    \"value\": \"<string>\",\n    \"active\": true\n  }\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("https://api.hel.io/v1/transaction/headless/prepare")
  .header("Content-Type", "application/json")
  .body("{\n  \"paymentRequestId\": \"<string>\",\n  \"senderPublicKey\": \"<string>\",\n  \"currencyId\": \"<string>\",\n  \"quantity\": 123,\n  \"minimalUnitAmount\": 123,\n  \"affiliateCode\": \"<string>\",\n  \"btcPublicKey\": \"<string>\",\n  \"customerDetails\": {\n    \"email\": \"<string>\",\n    \"discordUser\": {\n      \"id\": \"<string>\",\n      \"username\": \"<string>\"\n    },\n    \"twitterUsername\": \"<string>\",\n    \"telegramUser\": {\n      \"id\": 123,\n      \"username\": \"<string>\"\n    },\n    \"fullName\": \"<string>\",\n    \"country\": \"<string>\",\n    \"state\": \"<string>\",\n    \"city\": \"<string>\",\n    \"street\": \"<string>\",\n    \"streetNumber\": \"<string>\",\n    \"areaCode\": \"<string>\",\n    \"deliveryAddress\": \"<string>\",\n    \"blinkAddress\": \"<string>\",\n    \"phoneNumber\": \"<string>\",\n    \"additionalJSON\": \"<string>\",\n    \"btcProperties\": {\n      \"ordinalsAddress\": \"<string>\"\n    }\n  },\n  \"productDetails\": {\n    \"name\": \"<string>\",\n    \"value\": \"<string>\",\n    \"active\": true\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.hel.io/v1/transaction/headless/prepare")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"paymentRequestId\": \"<string>\",\n  \"senderPublicKey\": \"<string>\",\n  \"currencyId\": \"<string>\",\n  \"quantity\": 123,\n  \"minimalUnitAmount\": 123,\n  \"affiliateCode\": \"<string>\",\n  \"btcPublicKey\": \"<string>\",\n  \"customerDetails\": {\n    \"email\": \"<string>\",\n    \"discordUser\": {\n      \"id\": \"<string>\",\n      \"username\": \"<string>\"\n    },\n    \"twitterUsername\": \"<string>\",\n    \"telegramUser\": {\n      \"id\": 123,\n      \"username\": \"<string>\"\n    },\n    \"fullName\": \"<string>\",\n    \"country\": \"<string>\",\n    \"state\": \"<string>\",\n    \"city\": \"<string>\",\n    \"street\": \"<string>\",\n    \"streetNumber\": \"<string>\",\n    \"areaCode\": \"<string>\",\n    \"deliveryAddress\": \"<string>\",\n    \"blinkAddress\": \"<string>\",\n    \"phoneNumber\": \"<string>\",\n    \"additionalJSON\": \"<string>\",\n    \"btcProperties\": {\n      \"ordinalsAddress\": \"<string>\"\n    }\n  },\n  \"productDetails\": {\n    \"name\": \"<string>\",\n    \"value\": \"<string>\",\n    \"active\": true\n  }\n}"

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

{
  "transactionToken": "string",
  "transactionMessage": "string",
  "serializedTransaction": "string",
  "addressLookupTableAccounts": [
    "string"
  ]
}