If you use myidtravel to book oal tickets then yep can use credit card to pay. We booked 3hrs before departure, no problems at all. If, however, the airline you wish to use doesn't appear on myidtravel but is on the oal list in trips then there is no option to use credit card. I believe you can still book tickets through trips but it has to be approved by an office minion. Unfortunately there were none in the office over eid when I needed them 😡