Unfortunately for guests using Marriott's digital/mobile check-in service, this isn't always the case. Even guests who complete the online check-in process must present the physical credit card used to book the room. While it may seem unsurprising that front desk staff are required to confirm your credit card details, Marriott's mobile check-in instructions aren't straightforward. No section specifically says a physical credit card is needed, and there's room for unclear interpretation. Marriott's "Steps for using Mobile/Online Check-In" only reads: "For all Guests (Members and non-members) using Web Check-In we will need you to come to the Front Desk when you arrive to confirm Payment and Reservation information."