public async Task HandleAsync(SubscribeToTheNewsletter command, CancellationToken cancellationToken = default)
{
var subscriber = Subscriber.Subscribe(command.Id, command.Email);
var discount = _discountCodeGenerator.GenerateCodeForSubscriber(_identityProvider.Next(), subscriber.Id);
await _newsletterRepository.Add(subscriber, cancellationToken);
await _discountRepository.Add(discount, cancellationToken);
await _emailService.SendEmailWithDiscountCode(discount.GetCode(), cancellationToken);
}
