public GiftCard(Guid id, string providerName, ExpirationDate expiryDate)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException(nameof(id));
}
Id = id;
ProviderName = providerName ?? throw new ArgumentNullException(nameof(providerName));
ExpiryDate = expiryDate;
}
public void SetExpirationDate(ExpirationDate date)
{
ExpiryDate = date;
}