curl --request POST \
  --url https://thirdparty.qonto.com/v2/internal_transfers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Qonto-Idempotency-Key: <x-qonto-idempotency-key>' \
  --data '
{
  "internal_transfer": {
    "debit_iban": "IT12M3609201600032486198434",
    "credit_iban": "IT13M3609201600032486198435",
    "reference": "Internal transfer",
    "amount": "12345.67",
    "currency": "EUR"
  }
}
'

import requests

url = "https://thirdparty.qonto.com/v2/internal_transfers"

payload = { "internal_transfer": {
        "debit_iban": "IT12M3609201600032486198434",
        "credit_iban": "IT13M3609201600032486198435",
        "reference": "Internal transfer",
        "amount": "12345.67",
        "currency": "EUR"
    } }
headers = {
    "X-Qonto-Idempotency-Key": "<x-qonto-idempotency-key>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-Qonto-Idempotency-Key': '<x-qonto-idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    internal_transfer: {
      debit_iban: 'IT12M3609201600032486198434',
      credit_iban: 'IT13M3609201600032486198435',
      reference: 'Internal transfer',
      amount: '12345.67',
      currency: 'EUR'
    }
  })
};

fetch('https://thirdparty.qonto.com/v2/internal_transfers', 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://thirdparty.qonto.com/v2/internal_transfers",
  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([
    'internal_transfer' => [
        'debit_iban' => 'IT12M3609201600032486198434',
        'credit_iban' => 'IT13M3609201600032486198435',
        'reference' => 'Internal transfer',
        'amount' => '12345.67',
        'currency' => 'EUR'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "X-Qonto-Idempotency-Key: <x-qonto-idempotency-key>"
  ],
]);

$response = curl_exec($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://thirdparty.qonto.com/v2/internal_transfers"

	payload := strings.NewReader("{\n  \"internal_transfer\": {\n    \"debit_iban\": \"IT12M3609201600032486198434\",\n    \"credit_iban\": \"IT13M3609201600032486198435\",\n    \"reference\": \"Internal transfer\",\n    \"amount\": \"12345.67\",\n    \"currency\": \"EUR\"\n  }\n}")

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

	req.Header.Add("X-Qonto-Idempotency-Key", "<x-qonto-idempotency-key>")
	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://thirdparty.qonto.com/v2/internal_transfers")
  .header("X-Qonto-Idempotency-Key", "<x-qonto-idempotency-key>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"internal_transfer\": {\n    \"debit_iban\": \"IT12M3609201600032486198434\",\n    \"credit_iban\": \"IT13M3609201600032486198435\",\n    \"reference\": \"Internal transfer\",\n    \"amount\": \"12345.67\",\n    \"currency\": \"EUR\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://thirdparty.qonto.com/v2/internal_transfers")

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

request = Net::HTTP::Post.new(url)
request["X-Qonto-Idempotency-Key"] = '<x-qonto-idempotency-key>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"internal_transfer\": {\n    \"debit_iban\": \"IT12M3609201600032486198434\",\n    \"credit_iban\": \"IT13M3609201600032486198435\",\n    \"reference\": \"Internal transfer\",\n    \"amount\": \"12345.67\",\n    \"currency\": \"EUR\"\n  }\n}"

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