Why should you care?

You care about this when basic CRUD and RabbitMQ are working and you need reliable events, auth, or gradual migration from a legacy monolith.

See it live — copy this example

Create a Web API project (dotnet new webapi), paste the code, then run dotnet run.

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(o => o.Authority = "https://identity.shopnest.com");

Run Example »

This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.

What happened?

• The example shows Identity Server wired into Product Service.
• Read each line, run it locally, then change one setting and observe what breaks or improves.
• That is how teams learn in production too — small experiments, not big bang rewrites.

Try it yourself

1. Open or create the ShopNest project area for Product Service.
2. Apply the Identity Server pattern from the lesson example.
3. Run dotnet build && dotnet run (or docker compose up when the lesson uses containers).
4. Change a string or route in the example and save — watch Swagger or the RabbitMQ Management UI update.
5. Break the code on purpose (remove a semicolon), read the error message, then fix it.

Remember

Identity Server connects to Product Service in ShopNest Cloud-Native. Practice by editing the example yourself — do not only read. Move on when you can explain this topic in your own words without looking.

Real-world: Zoho-style SaaS billing

Billing, tenant provisioning, and feature flags are separate services. A billing fix deploys without redeploying the entire admin UI backend.

Outcome: Multi-tenant isolation and faster team velocity on subscription changes.