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## Tracking balance changes

There are tasks when you urgently need to do something when the user's balance changes. A frequent case of transferring data via websockets to the front-end.

Version 7.2 introduces an interface to which you can subscribe.
This is done using standard Laravel methods.
More information in the [documentation](https://laravel.com/docs/8.x/events).

```php
use Bavix\Wallet\Internal\Events\BalanceUpdatedEventInterface;

protected $listen = [
    BalanceUpdatedEventInterface::class => [
        MyBalanceUpdatedListener::class,
    ],
];
```

And then we create a listener.

```php
use Bavix\Wallet\Internal\Events\BalanceUpdatedEventInterface;

class MyBalanceUpdatedListener
{
    public function handle(BalanceUpdatedEventInterface $event): void
    {
        // And then the implementation...
    }
}
```

It worked!