For security reasons, it is not possible to switch a form of payment for a booking once the purchase has been completed. However, if you are requesting to make a change to your itinerary, you can sometimes add a different form of payment to pay for the airline's change fees. 

In most cases, if your booking was created within the past 24 hours, you may be able to cancel for a full refund and re-book with the desired form of payment.   

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