curl --request POST \
  --url https://app.alphapo.net/api/v2/crypto/withdrawal_instant_exchange \
  --header 'Content-Type: application/json' \
  --header 'X-Processing-Key: <api-key>' \
  --header 'X-Processing-Signature: <x-processing-signature>' \
  --data '
{
  "sender_currency": "EUR",
  "received_currency": "BTC",
  "sender_amount": "100",
  "address": "tb1qfdxh6gkfr0qgyatnlkd8khcnxph9tw06n6qwjc",
  "foreign_id": "withdrawal_123",
  "end_user_reference": "user_12345"
}
'

import requests

url = "https://app.alphapo.net/api/v2/crypto/withdrawal_instant_exchange"

payload = {
    "sender_currency": "EUR",
    "received_currency": "BTC",
    "sender_amount": "100",
    "address": "tb1qfdxh6gkfr0qgyatnlkd8khcnxph9tw06n6qwjc",
    "foreign_id": "withdrawal_123",
    "end_user_reference": "user_12345"
}
headers = {
    "X-Processing-Signature": "<x-processing-signature>",
    "X-Processing-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-Processing-Signature': '<x-processing-signature>',
    'X-Processing-Key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    sender_currency: 'EUR',
    received_currency: 'BTC',
    sender_amount: '100',
    address: 'tb1qfdxh6gkfr0qgyatnlkd8khcnxph9tw06n6qwjc',
    foreign_id: 'withdrawal_123',
    end_user_reference: 'user_12345'
  })
};

fetch('https://app.alphapo.net/api/v2/crypto/withdrawal_instant_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://app.alphapo.net/api/v2/crypto/withdrawal_instant_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([
    'sender_currency' => 'EUR',
    'received_currency' => 'BTC',
    'sender_amount' => '100',
    'address' => 'tb1qfdxh6gkfr0qgyatnlkd8khcnxph9tw06n6qwjc',
    'foreign_id' => 'withdrawal_123',
    'end_user_reference' => 'user_12345'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-Processing-Key: <api-key>",
    "X-Processing-Signature: <x-processing-signature>"
  ],
]);

$response = curl_exec($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://app.alphapo.net/api/v2/crypto/withdrawal_instant_exchange"

	payload := strings.NewReader("{\n  \"sender_currency\": \"EUR\",\n  \"received_currency\": \"BTC\",\n  \"sender_amount\": \"100\",\n  \"address\": \"tb1qfdxh6gkfr0qgyatnlkd8khcnxph9tw06n6qwjc\",\n  \"foreign_id\": \"withdrawal_123\",\n  \"end_user_reference\": \"user_12345\"\n}")

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

	req.Header.Add("X-Processing-Signature", "<x-processing-signature>")
	req.Header.Add("X-Processing-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://app.alphapo.net/api/v2/crypto/withdrawal_instant_exchange")
  .header("X-Processing-Signature", "<x-processing-signature>")
  .header("X-Processing-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"sender_currency\": \"EUR\",\n  \"received_currency\": \"BTC\",\n  \"sender_amount\": \"100\",\n  \"address\": \"tb1qfdxh6gkfr0qgyatnlkd8khcnxph9tw06n6qwjc\",\n  \"foreign_id\": \"withdrawal_123\",\n  \"end_user_reference\": \"user_12345\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.alphapo.net/api/v2/crypto/withdrawal_instant_exchange")

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

request = Net::HTTP::Post.new(url)
request["X-Processing-Signature"] = '<x-processing-signature>'
request["X-Processing-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"sender_currency\": \"EUR\",\n  \"received_currency\": \"BTC\",\n  \"sender_amount\": \"100\",\n  \"address\": \"tb1qfdxh6gkfr0qgyatnlkd8khcnxph9tw06n6qwjc\",\n  \"foreign_id\": \"withdrawal_123\",\n  \"end_user_reference\": \"user_12345\"\n}"

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