How can I change the card associated with an auction item?

e.g. if you bid on an item with a Visa and wanted to switch it to a MasterCard if you win

To change the card on file for a particular auction item, head to Bids, then click 'view / edit' on the item that you'd like to change the payment information for:
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From there, you can scroll down and add or attach a new card to the bid.
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