u/Spiritual_Form_1515

As a regular online buyer, I really want to try out 'Cart_in' to buy from Amazon(fr). I just wanted to know from others who have used Cart_in, are all purchases made through the mobile app itself? After the app has calculated the billing amount, is there any thng else to pay afterwards? In the event of a damaged or a non working product, what is the proceedure for exchange or returns? And, I see that there is free shipping for some products, is the free shipping only for first time buyers?