BillingPlan
constructor(id: String, name: String, fee: BillingMoneyAmount? = null, annualFee: BillingMoneyAmount? = null, annualMonthlyFee: BillingMoneyAmount? = null, description: String? = null, isDefault: Boolean, isRecurring: Boolean, hasBaseFee: Boolean, forPayerType: BillingPayerResourceType = BillingPayerResourceType.UNKNOWN, publiclyVisible: Boolean, slug: String, avatarUrl: String? = null, features: List<Feature> = emptyList(), unitPrices: List<BillingPlanUnitPrice>? = null, availablePrices: List<BillingPlanPrice>? = null, freeTrialDays: Int? = null, freeTrialEnabled: Boolean = false)