serialize method
Serializes information the current object
writer Serialization writer to use to serialize this model
Implementation
@override
void serialize(SerializationWriter writer) {
writer.writeIntValue('amount', amount);
writer.writeStringValue('currency', currency);
writer.writeObjectValue<ShippingRateFixedAmountCurrencyOptions>(
'currency_options', currencyOptions);
writer.writeAdditionalData(additionalData);
}