CalculatePaymentResponse

{
    "success": true,
    "data": {
        "fromAmount": 750.12,
        "toAmount": 500000,
        "targetAmountWithFee": 505000,
        "gateFee": 5000,
        "gateFeePercentage": 1,
        "exchangeRate": 666.6,
        "exchangeSource": "kuvarpay",
        "fees": {},
        "timestamp": "2025-01-01T12:00:00.000Z"
    }
}