Since 2012 I am using amazon app. In this time period amazon never cheat me. Good return police easy to retun a product. Safe payment option available there. You can also make payment through Amazon pay Upi. Where u can get cash back on mobile recharge, bill payment , ticket booking many more service available on amazon.
Products quality also good. Costmer service also good, friendly. I really love amazon app I mostly use amazon for online shopping. Now you can book grocery on amazon. It is totally reliable, secure. I suggest you try amazon once a time