Private channels data does not get received by clients - laravel

Question

I am not able to get private channels to work using Pusher and Laravel broadcasting. In the routes/channels.php file it seems that none of the function gets fired:
Broadcast::channel('App.User.{id}', function ($user, $id) {
return (int) $user->id === (int) $id;
});
Broadcast::channel('testevent.{id}', function ($user, $id)
{
//This never fires
dd("ENTERED HERE");
return TRUE;
});
In the BroadcastServiceProvider.php I have:
public function boot()
{
Broadcast::routes(['middleware' => 'auth:api']);
require base_path('routes/channels.php');
}
The Javascript file handling data on the client side (using Echo):
Echo.private('testevent.1').listen('TestEvent', function(e)
{
console.log(e);
});
Using public channels works perfect. But as soon as I try to create private channels the data is not sent to the client listening for the data. What could the problem be?
Thanks for any help and guidance!
EDIT:
In the Pusher web console it does not appear that the client has subscribed for the "testevent.1" channel. If I change this to a public channel the subscription gets registered.

Answer 1

At the "Defining authorization callbacks" paragraph of the Laravel Broadcast documentation, you can see that privates channels need to authenticate users before that they be able to listen to them.
So in in your routes/channels.php, you need there to write authentication logic, for exemple :
Broadcast::channel('testevent.{id}', function ($user, $id)
{
return $user->id === $user::findOrFail($id);
});