billing_state update

{
            postpay: {
                total_minutes: How much time user can spent on postpaid,
                spent_minutes: How much time user already spent on postpaid,
                spent_amount: How much money user must to pay for postpaid session
            }
            session_end_date: time the session ends,
            amount: User account amount,
            need_refill: Is user need refill,
            seconds_left: How many seconds left to session end,
            real_price_per_hour: Price per hour for current user,
            ticket: {
                purchase_date: Datetime when ticket was purchased,
                start_date: Datetime of the ticket activation,
                end_date: Datetime of the ticket ends,
                spent_minutes: Count of spent minutes on the ticket,
                name: Name of the ticket,
                price: Ticket price user payed,
            },
            tariff_level: {
                discount: Discount that provides current TariffLevel,
                experience: Experience of the current user account,
                level: Level of the current user account,
            },
            next_tariff_level: {
                discount: Discount that provides current TariffLevel,
                experience: Experience of the current user account,
                level: Level of the current user account,
            },
        },