class CreditCardService impletmetnts ICreditCardService
{
    public $subscriptionService;
    public $creditCardRepository;

    public function __contruct(ISubscriptionService $subscriptionService, $creditCardRepository ICreditCardRepository)
    {
        $this->subscriptionService = $subscriptionService;
        $this->creditCardRepository = $creditCardRepository;
    }

    public function remove(IUser $user)
    {
        // Удалять карту можно в случае если нет активных подписок.
        // Это можно понять из сервиса subscriptionService

        $issetActiveSubscription = $this->subscriptionService->issetAtLeastActiveSubscriptionByUser($user);
        if ($issetActiveSubscription) {
            // Нельзя удалять
            throw new Exception();
        }

        // удаляем карту
    }

    publicn function issetCard(IUser $user)
    {
        $cards = $this->creditCardRepository->getCardsByUserId($user->getId());

        return !empty($cards);
    }
}


class SubscriptionService implemets ISubscriptionService
{
    public $creditCardService;

    public function __contruct(ICreditCardService $creditCardService)
    {
        $this->creditCardService = $creditCardService;
    }

    public function activate(Subscription $subscription)
    {
        $issetCard = $this->creditCardService->issetCard($subscription->getUser());

        if ($issetCard) {
            $subscription->activate();
        } else {
            $subscription->suspend();
        }
    }
}