You bid with credits and get paid in credits no cash transactions at all. The shipping if not free is chosen by the person putting their items at auction. If you click on an item you'll go to the auction page, there it will tell you how much they want to ship the item to you and how they want you to pay it. It might say shipping is $3 dollars and I will accept paypal, money order, concealed cash, etc. Then you would have to send the shipping payment and they'll ship the item to you. It's suppose to be a fun way to give away your stuff for free, but at the same time get some credits for the item so you can bid on other free stuff people are giving away. I hope that helps alittle, if you still have more questions feel free to email me at misaandmisu@gmail.com. Goodluck!!!