<p>When a user signs up, a <span class="badge bg-dark">UserSignedUp</span> event is published.</p>

                    <p>In the simplest scenario, there's a single service with one handler subscribed to this event.
                    It's adds the user to the newsletter list.
                    </p>

                    <p>Flip the switch below to start sending messages and see what happens.</p>
                `,
                topic: "UserSignedUp-1",
                services: [
                    {