PremiumPaymentOption constructor
      const
      PremiumPaymentOption({})
     
    
Describes an option for buying Telegram Premium to a user
Implementation
const PremiumPaymentOption({
  required this.currency,
  required this.amount,
  required this.discountPercentage,
  required this.monthCount,
  required this.storeProductId,
  this.paymentLink,
});