i

I've only sold a few things on e-bay but actually, if memory serves, Paypal. E-Bay notifies you which user name won but the user supplies their address and the like through either E-Bay or through Paypal.

I think it's probably best if you set up an account on Paypal to put all of the money into and once each month's auction is done, use that account to send to the charities.

Both the seller and winning bidder get notifications and payment is up to whatever methods you allow. I don't know how it works with charities, though.

pity, i didn't win the painting (this time!), but at least i helped to raise a bar a bit :) good luck, it was a good move!