In app Purchase getting error

[jinks]

I have to get an error of the in-app purchase on ios platform.

I have implemented the code like

 this.iap
      .getProducts(['Productid'])
      .then((products) => {
        console.log(products);
      })
      .catch((err) => {
        console.log(err);
      });

Please give soution of in-Apppurchase ionic - ios platform.