Why should you care?

You care about this when one business action spans Order, Payment, and Inventory — and you cannot use one SQL transaction across three databases.

See it live — copy this example

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

public class PlaceOrderStateMachine : MassTransitStateMachine<PlaceOrderState>
{
    public State AwaitingPayment { get; private set; }
    // PaymentSucceeded → ReserveInventory → Completed
    // PaymentFailed → Compensate (cancel order)
}

Run Example »

Edit the code and click Run — like W3Schools Try it Yourself.

What happened?

• The example shows Orchestration Saga wired into Identity 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 Identity Service.
2. Apply the Orchestration Saga 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

Orchestration Saga connects to Identity 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: Swiggy order → restaurant → rider flow

When a customer confirms food order, events notify restaurant prep and rider dispatch. No single 30-second HTTP chain.

Outcome: Restaurant promos deploy without taking down payment processing.