add coupon endpoint and custom health check service collection extension

src/Services/Coupon/Coupon.API/Controllers/CouponController.cs

@@ -23,6 +23,22 @@
             _mapper = mapper;
         }
 
-        // Add the GetCouponByCodeAsync method
+        [HttpGet("{code}")]
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        [ProducesResponseType(StatusCodes.Status400BadRequest)]
+        [ProducesResponseType(StatusCodes.Status404NotFound)]
+        public async Task<ActionResult<CouponDto>> GetCouponByCodeAsync(string code)
+        {
+            var coupon = await _couponRepository.FindCouponByCodeAsync(code);
+
+            if (coupon is null || coupon.Consumed)
+            {
+                return NotFound();
+            }
+
+            var couponDto = _mapper.Translate(coupon);
+
+            return couponDto;
+        }
     }
 }

src/Services/Coupon/Coupon.API/Startup.cs

@@ -34,7 +34,8 @@ namespace Coupon.API
                 .AddEventBus(Configuration)
                 .AddCustomAuthentication(Configuration)
                 .AddCustomAuthorization()
-                .AddSwagger(Configuration);
+                .AddSwagger(Configuration)
+                .AddCustomHealthCheck(Configuration);
 
             services.AddTransient<IIntegrationEventHandler<OrderStatusChangedToAwaitingCouponValidationIntegrationEvent>, OrderStatusChangedToAwaitingCouponValidationIntegrationEventHandler>();
             services.AddTransient<IIntegrationEventHandler<OrderStatusChangedToCancelledIntegrationEvent>, OrderStatusChangedToCancelledIntegrationEventHandler>();
@@ -68,7 +69,15 @@ namespace Coupon.API
                 .UseEndpoints(endpoints =>
                 {
                     endpoints.MapControllers();
-                    // Add the endpoints.MapHealthChecks code
+                    endpoints.MapHealthChecks("/hc", new HealthCheckOptions
+                    {
+                        Predicate = _ => true,
+                        ResponseWriter = UIResponseWriter.WriteHealthCheckUIResponse
+                    });
+                    endpoints.MapHealthChecks("/liveness", new HealthCheckOptions
+                    {
+                        Predicate = r => r.Name.Contains("self")
+                    });
                 });
 
             ConfigureEventBus(app);