How to store FCM messege data

I use FCM in my project, when the app is open notification didn’t show up.I want to store the messaging data in to variables in both time(app is in back ground/ killed and open).


FCMPlugin.getToken((token)=>{

      this.http.get('https://faizy.000webhostapp.com/firemsg.php?id='+token, {}, {})
        .then(data => {      
        })
        .catch(error => {
        });

    });