Quote:
Originally Posted by starpimps
There are quite a few businesses that do this.
such as couriers, restaurants and gas stations;
->Do you need a fill up up to $120?
-->YES
--->pump up to $97.58 full tank.
check your avail balance its not -$97.58 but rather -$120
after it settles you get back your $22.42 that you didnt use.
surfer signsup for a free trial and gets a preauth of -29.95 IF he stays a member for the rebill period.
if he cancels it before the trial period is over the preauth goes away and the avail credit goes back to +29.95.
same difference 
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I understand how a preauth works, I'm just trying to comprehend how it could be used for a FREE TRIAL. In the gas scenario the actual transaction amount is known 5 minutes later as you finish pumping, in a free trial scenario the transaction may stay in a preauth state for 2 or 3 days?... How can selling a free trial which reduces your available balance be considered ethical?