PremiumStatePaymentOption constructor
      const
      PremiumStatePaymentOption({ 
    
- required PremiumPaymentOption paymentOption,
- required bool isCurrent,
- required bool isUpgrade,
- required String lastTransactionId,
Describes an option for buying or upgrading Telegram Premium for self
Implementation
const PremiumStatePaymentOption({
  required this.paymentOption,
  required this.isCurrent,
  required this.isUpgrade,
  required this.lastTransactionId,
});