New Receipt technology

We all know that keeping our receipt is actually a huge hassle to each one of us. We can misplace them, accidentally soaked in the water etc. Making this new technology that I will propose will help not only the people but the nature itself. I think electronic Receipts or paperless receipts will help us keep our receipt safely especially those receipts with warranty that are actually very important to not misplace it. This kind of idea might be too early in this generation to be implemented, but later on this idea will be a great help and solution to each of us people. Instead of using paper to put all the item that we bought why not put it in the phone so people can see their receipt/transaction every time and also receipts with warranty will be safely stored in the phone and by using cloud all their transactions and receipts will be stored there. We know that every day people can receive many receipts. Since, every transaction that we made will actually be printed with receipts. There are even store's that have this kind of features like amazon, example url: https://www.youtube.com/watch?v=NrmMk1Myrxc. Amazon might be the first company to offer paperless receipts of your transaction.