I pay everything on line, or through my bank account, BUT they have to send me a paper receipt, usually three or four pages about what and why I payed. The bank have to send me a paper account of almost every operations, CC included.
Plus, in Italy the warranty should report the receipt of payment. Even if you buy a sofa, that has a one year warranty, you should keep all this paper stuff for at least one year. And what about every damn electronic and electric stuff you have at home: fridge, stereo, washing machine, tv, computer, printer...you name it, instructions... and warranty
I tried to keep low the shit of papers, but I lost.