toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (billingAccount != null) 'billingAccount': billingAccount!,
if (paymentCycle != null) 'paymentCycle': paymentCycle!,
if (paymentPlan != null) 'paymentPlan': paymentPlan!,
if (paymentType != null) 'paymentType': paymentType!,
if (trialPeriod != null) 'trialPeriod': trialPeriod!,
};