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API Layer

  • CardController exposes a single HTTP GET endpoint: /api/v1/Card?UserId=abc&CardNumber=xyz

  • Incoming request is validated via FluentValidation.

  • Card data is fetched from an injected provider (SQL, Kafka, or Sample).
  • Card actions are resolved through CardResolver.
  • Response is returned in JSON array format (e.g., ["ACTION1", "ACTION3"]).

Authorization header required: ```text X-API-KEY: test-key