Use a travel platform that allows adding a central card for all bookings made on the platform. Hence, employees can book their travel while charging a central company card for each booking. Some travel platforms also allow a wallet system, wherein the company can deposit an amount with the platform. Every travel booking will be charged to that wallet until the balance expires. In this case, employees need not use their personal cards for booking business travel. For non-travel expenses like meals, local cabs, etc., issue corporate cards to employees to avoid out-of-pocket expenses.