SendInvoiceEmailRequest

{
    "customerEmail": "john@example.com",
    "customerName": "John Doe",
    "businessName": "My Business",
    "invoiceNumber": "INV-202501-0001",
    "amount": 102500,
    "currency": "NGN",
    "description": "Invoice for web development services",
    "notes": "Payment due within 30 days",
    "dueDate": "2025-02-01T00:00:00Z",
    "contactEmail": "support@mybusiness.com",
    "paymentUrl": "https://payment.rayswap.exchange/invoice/inv_123456",
    "business": {
        "id": "biz_123",
        "name": "My Business",
        "email": "contact@mybusiness.com",
        "currency": "NGN"
    }
}