If it's a debit card, the money gets withdrawn from the checking account it is connected to. When they get their bank statement, they will see the amount withdrawn and where the purchase was made, but it won't have the detail of what was purchased.
Debit cards draw funds from a checking account. They will not know what you bought, but it will show where, the amount and the date of sale. Pre-paid cards are reload able. You need to be careful with a debit card. Too big a purchase and you can overdraft the checking account it is drawn on!
A Visa Debit Card can be used to debit funds from a checking account or as a credit card. So for debit it would be money you already have in the bank and credit card for money you don't. Prepaid cards are when you put a certain amount on the card and when that is spent you have to add more. I believe that's the way that one works. Always protect your credit rating because it takes seven yrs to clean it up. Even if you are late on one payment.