// Conserva la chiave in una variabile d’ambiente sul server.
const NEXWA_KEY = process.env.NEXWA_KEY;
async function nexwa(action, params = {}) {
  const response = await fetch('https://nexwa.store/api/v2', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: new URLSearchParams({ key: NEXWA_KEY, action, ...params })
  });
  let data;
  try { data = await response.json(); } catch { data = null; }
  const apiError = data && !Array.isArray(data) && typeof data === 'object'
    && Object.hasOwn(data, 'error');
  const retryAfter = response.headers.get('Retry-After');
  if (response.status >= 400 || apiError || data === null) {
    const message = apiError ? [data.code, data.error].filter(Boolean).join(': ') : 'Risposta non JSON o richiesta non riuscita';
    const error = new Error(`${message} (HTTP ${response.status})${retryAfter ? `; Retry-After: ${retryAfter}` : ''}`);
    error.code = apiError ? data.code || data.error : null;
    error.status = response.status;
    error.retryAfter = retryAfter;
    throw error;
  }
  return data;
}
// Catalogo con ID e prezzi
const services = await nexwa('services');
// Saldo disponibile
const balance = await nexwa('balance');
// Nuovo ordine
// Riusa lo stesso idempotency_key quando ripeti una richiesta.
const order = await nexwa('add', {
  service: 142, quantity: 1000,
  link: 'https://instagram.com/example',
  idempotency_key: 'client-order-8842'
});
// Stato dell’ordine
console.log(await nexwa('status', { order: order.order }));

<?php
// Conserva la chiave in una variabile d’ambiente sul server.
function nexwa(string $action, array $params = []): array {
    $retryAfter = null;
    $ch = curl_init('https://nexwa.store/api/v2');
    curl_setopt_array($ch, [
        CURLOPT_POST => true, CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 30,
        CURLOPT_HEADERFUNCTION => function ($ch, string $header) use (&$retryAfter): int {
            if (preg_match('/^HTTP\//i', $header)) $retryAfter = null;
            if (stripos($header, 'Retry-After:') === 0) $retryAfter = trim(substr($header, 12));
            return strlen($header);
        },
        CURLOPT_POSTFIELDS => http_build_query(
            array_merge(['key' => getenv('NEXWA_KEY'), 'action' => $action], $params)
        ),
    ]);
    $response = curl_exec($ch);
    $error = curl_error($ch);
    $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    if ($response === false) throw new Exception($error);
    $data = json_decode($response, true);
    $apiError = is_array($data) && array_key_exists('error', $data);
    if ($status >= 400 || $apiError || !is_array($data)) {
        $message = $apiError ? (($data['code'] ?? '') . ': ' . (string) $data['error']) : 'Risposta non JSON o richiesta non riuscita';
        throw new RuntimeException($message . " (HTTP $status)"
            . ($retryAfter !== null ? "; Retry-After: $retryAfter" : ''), $status);
    }
    return $data;
}
// Catalogo con ID e prezzi
$services = nexwa('services');
// Saldo disponibile
$balance = nexwa('balance');
// Nuovo ordine
// Riusa lo stesso idempotency_key quando ripeti una richiesta.
$order = nexwa('add', [
    'service' => 142, 'quantity' => 1000,
    'link' => 'https://instagram.com/example',
    'idempotency_key' => 'client-order-8842',
]);
// Stato dell’ordine
print_r(nexwa('status', ['order' => $order['order']]));

# pip install requests
import os
import requests

# Conserva la chiave in una variabile d’ambiente sul server.
KEY = os.environ["NEXWA_KEY"]
URL = "https://nexwa.store/api/v2"
def nexwa(action, **params):
    response = requests.post(
        URL, data={"key": KEY, "action": action, **params}, timeout=30
    )
    try:
        data = response.json()
    except ValueError:
        data = None
    api_error = isinstance(data, dict) and "error" in data
    retry_after = response.headers.get("Retry-After")
    if response.status_code >= 400 or api_error or data is None:
        message = ": ".join(str(data[k]) for k in ("code", "error") if k in data) if api_error else "Risposta non JSON o richiesta non riuscita"
        detail = f"{message} (HTTP {response.status_code})"
        if retry_after is not None:
            detail += f"; Retry-After: {retry_after}"
        error = RuntimeError(detail)
        error.code = data.get("code", data["error"]) if api_error else None
        error.status = response.status_code
        error.retry_after = retry_after
        raise error
    return data

# Catalogo con ID e prezzi
services = nexwa("services")
# Saldo disponibile
balance = nexwa("balance")
# Nuovo ordine
# Riusa lo stesso idempotency_key quando ripeti una richiesta.
order = nexwa(
    "add", service=142, quantity=1000,
    link="https://instagram.com/example",
    idempotency_key="client-order-8842",
)
# Stato dell’ordine
print(nexwa("status", order=order["order"]))