1) When you check-in, you pay for the total room (if not pre-paid).
2) This payment can be
. . . cash
. . . credit card
. . . debit card
. . . traveler's cheque
3) A credit card or cash deposit IS NOT required.
4) If desired, you can give cash or credit card deposits for room key charges.
5) But, without a deposit, you cannot charge ANYTHING, including
. . . telephone calls
. . . food
. . . purchases