WHAT DO YOU GET WHEN YOU BUY A PRODUCT?
Most Spanish people would tell me that you get a "ticket" but this is not correct in English. A "ticket" in English is only used in very specific situations which include: "cinema or theatre tickets" or a "parking ticket" (which means "una multa").
The thing that you get when you buy a product is a "receipt".
So remember, at Christmas when you get all your presents, you need to keep the "ticket regalo" or in English: "The receipt".
Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 10 años de experiencia enseñando inglés a españoles.