Sending notification to specific user

[JoakimJohansen]

I am currently working on a queue app and want users to get a notification when they are first in line.
I am very new to React Native and have never used One Signal before, but decided I wanted to use it.

All code below is part of my componentWillMount() method.
The part before the if-sentence is not working the way I want as I am not receiving any notification when OneSingal.postNotification(contents, data, playerId) is called. How should postNotification be formatted? Because right now nothing happens.

The part inside the sentence results in a error in the emulator when ran. Error is stating that the OneSignal.idsAvaliable() is not a function. I just tried to follow this; #4

  const data = null; // some array
  const contents = 'You are first in line';
  const playerId = '7997ab8f-3029-4e2c-b58e-3072e0284435';
  OneSignal.postNotification(contents, data, playerId);

//Checks current users place in line (if 1 a notification should be sent)
  if (this.props.place === 1) {
    console.log('you are first');
    OneSignal.idsAvailable((idsAvailable) => {
      console.log(idsAvailable.playerId);
      console.log(idsAvailable.pushToken);
      OneSignal.postNotification(contents, data, idsAvailable.playerId);
    });
  }

Any help would be much apreciated. I have gone through basically all information I could find on OneSignal and other similar threads. As I said I dont have much experience and the OneSignal documentation was not very helpful and too abstract. Thanks

[xinhash]

You should add the below line to your component will mount function
OneSignal.addEventListener("ids", this.onIds);
and have a function

onIds = device => {
    console.log(device.userId);
    console.log(device.pushToken);
}

[leoskyrocker]

change

const contents = 'You are first in line';

to

const contents = {'en': 'You are first in line'};