You log into their site, tell them how much of a "credit limit" you want and how long the credit card number should be active.
Works pretty good if you ask me.
We've improved Slashdot's video section; now you can view our video interviews, product close-ups and site visits with all the usual Slashdot options to comment, share, etc. No more walled garden! It's a work in progress -- we hope you'll check it out (Learn more about the recent updates).
"You must have an IQ of at least half a million." -- Popeye