on 10-27-2013 10:52 AM
Do you mean VISA, AMEX, MasterCard & Discover gift cards?
eBay / Paypal has recently added a link in the checkout process for inputting gift cards.
Look for it here:
on the first page after you've logged in to your Paypal account,
locate the usual change link for changing your funding source.
The link for inputting gift cards is to the right of the change link.