How to handle data payload from push notification when app is not active?

Question

iOS

Some say it's possible, others don't. The documentation says:

Your app can still receive data messages when it is in the background...

But how? I tried different options, but I have not yet achieved the desired result.
For example. The application is not active. I send this message:

{
  "to": "...",
  "priority": "high",
  "notification": {
    "title": "Заголовок",
    "body": "Текст сообщения",
    "sound": "default"
  },
  "data": {
    "title": "Заголовок",
    "message": "Текст сообщения",
    "payload": {
      "key_one": "val_one",
      "key_two": "val_two"
    },
    "content_available": true,
    "timestamp": "2017-04-17 16:51:58"
  }
}

A notification appears in the tray. But:

1. If you tap on it, a message opens and the same notification appears in the tray again (this is triggered by my internal data payload handler).
   
2. If you open the application not from a notification, but from the main icon on the desktop, then a duplicate notification does not appear. But payload data is not processed at the same time.
   

I need to not only notify the user about this when receiving a notification, but also physically make changes to the application database.
Maybe I'm digging in the wrong direction?

Answer 1

You need to remove the notification block and make the notification yourself. Then the application will always be called