Fee

如果手续费以baseAmount（源账户）货币计价，有效汇率 = (baseAmount - fees.feeAmount.currencyAmount的总和) * baseRate / baseAmount。如果手续费以transferAmount（目的账户）货币计价，有效汇率 = (（baseAmount * baseRate） - fees.feeAmount.currencyAmount的总和) / baseAmount。

{
    "feeId": "string",
    "feeType": "MISCELLANEOUS_FEE",
    "feeRateValue": "string",
    "feeAmount": {
        "currencyCode": "string",
        "currencyAmount": 0
    }
}