Automatic Payment

[abw11365]

I have had some buyers that I can't send an "invoice" to and offer combined shipping because they have their account set on auto pay 1 hour after the auction ends. I have handled that by sending a partial refund after they pay. However, I wanted to set my account to auto pay for a period of time while I am away on vacation without internet access so that if I win anything I am bidding on, the auction is still paid for in my absence. But I have looked all over eBay and can't find how to set this to happen. So two questions:

- How do I set it to auto pay for auctions I win?

- Can it be cancelled when I get back to civilization?

Thanks!