CreatePayInRequest

{
    "amount": 125.5,
    "country": "BR",
    "currency": "BRL",
    "payment_method": "top_up",
    "merchant_order_reference": "ORDER-2026-0001",
    "merchant_transaction_reference": "TRX-2026-0001",
    "merchant_customer_id": "customer@email.com",
    "customer_ip": "192.168.0.1",
    "fields": {
        "first_name": "João",
        "last_name": "Silva",
        "document_number": "241.390.720-32"
    },
    "return_urls": {
        "success_url": "https://merchant.com/payment-success",
        "pending_url": "https://merchant.com/payment-pending",
        "failure_url": "https://merchant.com/payment-failure"
    }
}