public Task Decrease(IExtraAmount extraAmount)
 {
     return(_table.ReplaceAsync(extraAmount.Address, amountEntity =>
     {
         amountEntity.Amount -= extraAmount.Amount;
         return amountEntity;
     }));
 }
 public void AddExtraAmount(IExtraAmount extraAmount)
 {
     _extraAmounts.Add(extraAmount);
 }