BillingSubscription
constructor(id: String, activeAt: Long? = null, createdAt: Long, nextPayment: BillingSubscriptionNextPayment? = null, pastDueAt: Long? = null, status: BillingSubscriptionStatus = BillingSubscriptionStatus.UNKNOWN, subscriptionItems: List<BillingSubscriptionItem> = emptyList(), updatedAt: Long? = null, eligibleForFreeTrial: Boolean = false)