I'm working on a new plugin and I want it to send a notification to a user, I followed the example in this forum, and also copied code from the Friends plugin and modified it to my needs. However, it does not send a notification, can anyone see what I have done wrong?

$notificationParams = array(            

'pluginKey'=>$this->pkey,

'action'=>'increaseBalance',            

'entityType'=>$this->pkey.'_increaseBalance',            

'entityId'=>$entityId,            

'userId'=>$receiver,            

'time'=>$timeStamp       

);

$notificationData = array(            

'string'=>array(                

'key'=>$this->pkey.'+increaseBalance_notification_string',                

'vars'=>array(                   

'amount'=>$amount,

'fromUsername'=>$fromUsername,

'fromUrl'=>$fromUrl,

'reason'=>$detail                

)            

),            

'avatar'=>$avatars[$avatarUser],            

'url'=>$this->router->urlForRoute('ofcreditservice_log')        

);

$notificationEvent = new OW_Event('notifications.add', $notificationParams, $notificationData);        OW::getEventManager()->trigger($notificationEvent);