const BASE_URL = 'https://app.sxdigitalpay.com/api/v1';
const response = await fetch(`${BASE_URL}/payment-links`, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'YOUR_API_KEY'
  },
  body: JSON.stringify({
    title: 'Pedido #12345',
    amount: 150.00,
    externalReference: 'order_12345',
    webhookUrl: 'https://seu-site.com/webhook'
  })
});

const data = await response.json();

// Send user to checkout
window.open(data.paymentLink.url, '_blank');