toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (introductoryPriceAmountMicros != null)
'introductoryPriceAmountMicros': introductoryPriceAmountMicros!,
if (introductoryPriceCurrencyCode != null)
'introductoryPriceCurrencyCode': introductoryPriceCurrencyCode!,
if (introductoryPriceCycles != null)
'introductoryPriceCycles': introductoryPriceCycles!,
if (introductoryPricePeriod != null)
'introductoryPricePeriod': introductoryPricePeriod!,
};