# Register to topics

Once you have a notification token you can register this device to push notifications and register to topics:

```dart
MPush.onToken = (token) async {
  print("Token received $token");
  await MPush.registerDevice(token).catchError(
    (error) => print(error),
  );
  await MPush.registerToTopic(MPTopic(code: 'Topic')).catchError(
    (error) => print(error),
  );
  print('Registered');
};
```

The topic are instances of the `MPTopic` class which has 3 properties:

* `code`: the id of the topic
* *\[Optional]* `title`: the readable title of the topic that will be displayed in the dashboard, if this is not set it will be equal to `code`.
* *\[Optional]* `single`: if this topic represents a single device or a group of devices, by default `false`.


---

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.mpush.cloud/flutter-sdk/register-to-topics.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.