public static bool IsStatusLive(PlanSubscriptionState state)
 {
     return LiveStates.Union(ProblemStates).Contains(state);
 }
 internal SubscriptionStateChangeBillingEvent(long organisationID, int subscriptionID, PlanSubscriptionState newState)
     : base(organisationID)
 {
     SubscriptionID = subscriptionID;
     NewState = newState;
 }