Трансграничные платежи — Redirect

const crypto = require('crypto');

function calculateSignature(method, url, body, secret) {
  const stringToSign = method + url + (body || '');
  const hmac = crypto.createHmac('sha256', secret);
  hmac.update(stringToSign);
  return hmac.digest('base64');
}

const method = 'POST';
const url = 'https://api.meridian.vip/api/v1/transgran/redirect-payments';
const body = JSON.stringify({
  amount: 1000,
  currency: 'RUB',
  bank: 2, // Sberbank
  internalId: 'order-12345',
  customerEmail: '[email protected]',
  notificationUrl: 'https://your-site.com/webhooks/transgran',
  notificationToken: 'your-webhook-secret-token',
  successUrl: 'https://your-site.com/payment/success',
  cancelUrl: 'https://your-site.com/payment/cancel',
  errorUrl: 'https://your-site.com/payment/error'
});

const apiKey = 'meridian_abc123...:meridian_xyz789...';
const [keyId, secret] = apiKey.split(':');
const signature = calculateSignature(method, url, body, secret);

const response = await fetch(url, {
  method,
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': apiKey,
    'X-Signature': signature
  },
  body
});

const result = await response.json();

// Перенаправьте клиента на страницу оплаты
console.log('Redirect URL:', result.paymentUrl);
// → "https://securepaymer.com/pay/aB3xK9mN..."