How to check a non-consumeble product is already owned/purchased in ionic 3?

Ionic Framework
1

I have a video list page.on click video i have to check is video is purchased or owned. so write code like this.

gotoVideo(video:any){
    alert(JSON.stringify(video))
    if(video.product_id == null || video.product_id == ''){
      this.navCtrl.push(SingleVideoPage,{video:video,user_type:"student"});
    }else{
      if(video.owned == true){
        //go
        this.navCtrl.push(SingleVideoPage,{video:video,user_type:"student"});
      }else{
        let iapProduct:IAPProduct = this.store.products.find(p => p.id == video.product_id);
        this.store.order(iapProduct).then(p => {
           // Purchase in progress!
          // alert(JSON.stringify(p))
        }, e => {
          // alert(JSON.stringify(e))
          this.presentAlert(`Failed to purchase: ${e}`);
        }).catch((e)=>{
          // alert(JSON.stringify(e))
        });
        this.store.when('product')
        .owned((p: IAPProduct) => {
          alert('owned')
          p.finish();
          this.ref.detectChanges();
          return p.verify();
        });
        this.store.when('product')
        .approved((p: IAPProduct) => {
          alert('approved')
          p.finish();
         this.ref.detectChanges();
         return p.verify();
        });
  }
    }
 }

But it doesnt work. always owned:false in sandbox
How to achive this.please help me.