I have recently Pre-ordered a wide variety of games for my Xbox One (over $1000 MSRP worth)at Bestbuy and currently have them all under the same payment type (my bestbuy card).
I think my bestbuy card will be expiring soon now that Bestbuy is switching to Visa cards, meaning my pament type will soon be invalid. There is currently no option to change the payment type for my Pre-orders, and some of them are sold out with no chance of coming back in stock (Black ops 3 Juggernog Edition). So I am really hoping that these orders don't get canceled due to there being no option to change the payment type, Please consider adding this option as it would really come in handy, another great option would be adding the option for a 2nd payment type.
If there is already some way of doing this please let me know.