toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (costType != null) 'costType': costType!,
if (feeAmount != null) 'feeAmount': feeAmount!,
if (feePercentageMillis != null)
'feePercentageMillis': feePercentageMillis!,
if (feeType != null) 'feeType': feeType!,
if (invoiceType != null) 'invoiceType': invoiceType!,
};