Services and Dependencies

Service	Responsibility	Owns
API Gateway	Public routing, request policy, response shaping	client rate counters
Identity Service	API keys, OAuth, sessions, permissions	principals, credentials
Catalog Service	Canonical game graph and metadata	games, people, categories
Pricing Service	Offer observations and current price projection	offers, price history
Deals Engine	Eligibility and ranking	deals, scores
Wishlist Service	User game collections and alerts	wishlists, alerts
Notification Service	Delivery orchestration	deliveries, preferences
Integration Service	Connector lifecycle and normalization	source mappings
Analytics Service	Aggregated trends and usage	rollups
Realtime Gateway	Connection state and fan-out	subscriptions
Export Service	Asynchronous snapshots	export jobs

Services may read published projections from another domain but only the owning service writes its source of truth. Synchronous calls have a 750 ms default deadline. Cross-domain mutations are events, avoiding distributed transactions.

flowchart LR
  Catalog -->|GameMerged| Pricing
  Pricing -->|OfferChanged| Deals
  Deals -->|DealPublished| Notification
  Deals -->|DealPublished| Realtime
  Wishlist -->|AlertMatched| Notification