To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
This product is really amazing but my credit card no got stolen after making purchase from your app. My bank infomed me my credit card was used on Amazon app from US. How is this happen? Not using your app ever again.