عرض عملي: انعكاس الاعتماديات لمزوّد دفع

خطوة بخطوة

1. Show CheckoutService calling new StripeClient() directly; tests need the network.
2. Extract the PaymentProvider interface.
3. Inject it through the constructor.
4. Planned mistake: the interface exposes Stripe-specific types, so the core still depends on Stripe. Fix: use Shop's own types (Money, Receipt) in the interface.
5. Write a fake provider for tests; run them without a network.
6. Add a second provider without touching CheckoutService.

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