> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-platform-docs-release.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Security Extensions

> Flutter SDK implementation examples for Security extensions including Disappearing Messages

This page contains Flutter SDK code examples for Security extensions. For feature documentation, setup instructions, and extension settings, see [Security Extensions](/fundamentals/extensions-security).

## How to Use Extensions with SDK

<Steps>
  <Step title="Enable in Dashboard">
    Login to [CometChat Dashboard](https://app.cometchat.com/login), select your app, then go to **Chat & Messaging → Features** and enable the extension.
  </Step>

  <Step title="Implement SDK methods">
    Use the code examples below to schedule messages for automatic deletion.
  </Step>

  <Step title="Build your UI">
    Update your UI to indicate which messages will disappear and when.
  </Step>
</Steps>

***

## Disappearing Messages

Send messages that automatically disappear after a specified time interval.

### Schedule Message for Deletion

```dart theme={null}
// First, send the message
TextMessage textMessage = TextMessage(
  text: 'This message will disappear!',
  receiverUid: 'cometchat-uid-1',
  receiverType: CometChatReceiverType.user,
);

CometChat.sendMessage(textMessage,
  onSuccess: (BaseMessage message) {
    // Now schedule it for deletion
    Map<String, dynamic> body = {
      'msgId': message.id,
      'timeInMS': DateTime.now().millisecondsSinceEpoch + 60000, // 1 minute from now
    };

    CometChat.callExtension('disappearing-messages', 'DELETE', '/v1/disappear', body,
      onSuccess: (Map<String, dynamic> response) {
        debugPrint('Message scheduled for deletion');
      },
      onError: (CometChatException e) {
        debugPrint('Error scheduling deletion: ${e.message}');
      }
    );
  },
  onError: (CometChatException e) {
    debugPrint('Error sending message: ${e.message}');
  }
);
```

<Warning>
  The value of `timeInMS` should be less than 1 year from the current time.
</Warning>