diff --git a/services/promotion-service-net/src/PromotionService.API/Program.cs b/services/promotion-service-net/src/PromotionService.API/Program.cs
index 38ac804c..ddddc9c3 100644
--- a/services/promotion-service-net/src/PromotionService.API/Program.cs
+++ b/services/promotion-service-net/src/PromotionService.API/Program.cs
@@ -87,6 +87,31 @@ try
             Version = "v1",
             Description = "PromotionService microservice API / API microservice PromotionService"
         });
+
+        // EN: Add JWT Bearer security definition / VI: Thêm định nghĩa bảo mật JWT Bearer
+        options.AddSecurityDefinition("Bearer", new Microsoft.OpenApi.Models.OpenApiSecurityScheme
+        {
+            Description = "JWT Authorization header using the Bearer scheme. Enter 'Bearer' [space] and then your token.",
+            Name = "Authorization",
+            In = Microsoft.OpenApi.Models.ParameterLocation.Header,
+            Type = Microsoft.OpenApi.Models.SecuritySchemeType.ApiKey,
+            Scheme = "Bearer"
+        });
+
+        options.AddSecurityRequirement(new Microsoft.OpenApi.Models.OpenApiSecurityRequirement
+        {
+            {
+                new Microsoft.OpenApi.Models.OpenApiSecurityScheme
+                {
+                    Reference = new Microsoft.OpenApi.Models.OpenApiReference
+                    {
+                        Type = Microsoft.OpenApi.Models.ReferenceType.SecurityScheme,
+                        Id = "Bearer"
+                    }
+                },
+                Array.Empty<string>()
+            }
+        });
     });
 
     // EN: Add health checks / VI: Thêm health checks