toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (freeTrialDuration != null) 'freeTrialDuration': freeTrialDuration!,
if (introductoryPricingDetails != null)
'introductoryPricingDetails': introductoryPricingDetails!,
if (promotion != null) 'promotion': promotion!,
if (type != null) 'type': type!,
};