curl --request POST \
  --url https://api.hotstuff.trade/exchange \
  --header 'Content-Type: application/json' \
  --data '
{
  "action": {
    "data": {
      "code": "REF_MKZFZFZK",
      "nonce": 1769690420912
    },
    "type": "createReferralCode"
  },
  "signature": "0x852044390aaf68b329302ad7af9d2d5443eebd3b8a098b092e7e0c1b530c45b7...",
  "nonce": 1769690420912
}
'

import requests

url = "https://api.hotstuff.trade/exchange"

payload = {
    "action": {
        "data": {
            "code": "REF_MKZFZFZK",
            "nonce": 1769690420912
        },
        "type": "createReferralCode"
    },
    "signature": "0x852044390aaf68b329302ad7af9d2d5443eebd3b8a098b092e7e0c1b530c45b7...",
    "nonce": 1769690420912
}
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({
    action: {data: {code: 'REF_MKZFZFZK', nonce: 1769690420912}, type: 'createReferralCode'},
    signature: '0x852044390aaf68b329302ad7af9d2d5443eebd3b8a098b092e7e0c1b530c45b7...',
    nonce: 1769690420912
  })
};

fetch('https://api.hotstuff.trade/exchange', 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.hotstuff.trade/exchange",
  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([
    'action' => [
        'data' => [
                'code' => 'REF_MKZFZFZK',
                'nonce' => 1769690420912
        ],
        'type' => 'createReferralCode'
    ],
    'signature' => '0x852044390aaf68b329302ad7af9d2d5443eebd3b8a098b092e7e0c1b530c45b7...',
    'nonce' => 1769690420912
  ]),
  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.hotstuff.trade/exchange"

	payload := strings.NewReader("{\n  \"action\": {\n    \"data\": {\n      \"code\": \"REF_MKZFZFZK\",\n      \"nonce\": 1769690420912\n    },\n    \"type\": \"createReferralCode\"\n  },\n  \"signature\": \"0x852044390aaf68b329302ad7af9d2d5443eebd3b8a098b092e7e0c1b530c45b7...\",\n  \"nonce\": 1769690420912\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.hotstuff.trade/exchange")
  .header("Content-Type", "application/json")
  .body("{\n  \"action\": {\n    \"data\": {\n      \"code\": \"REF_MKZFZFZK\",\n      \"nonce\": 1769690420912\n    },\n    \"type\": \"createReferralCode\"\n  },\n  \"signature\": \"0x852044390aaf68b329302ad7af9d2d5443eebd3b8a098b092e7e0c1b530c45b7...\",\n  \"nonce\": 1769690420912\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.hotstuff.trade/exchange")

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  \"action\": {\n    \"data\": {\n      \"code\": \"REF_MKZFZFZK\",\n      \"nonce\": 1769690420912\n    },\n    \"type\": \"createReferralCode\"\n  },\n  \"signature\": \"0x852044390aaf68b329302ad7af9d2d5443eebd3b8a098b092e7e0c1b530c45b7...\",\n  \"nonce\": 1769690420912\n}"

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

{
  "tx_hash": "0x93c0692352b3256a22067f845ca0be1a4271684e90454418411b5f7e86ba7500",
  "tx_type": 1208,
  "success": true,
  "data": {},
  "address": "0xEc6d21B8c1FF6dF523F22c4cf54F077e5F7cAfBf"
}