If you want to authorize a credit card charge and not actually charge the card, you can set the appconfig 'TransactionMode' to 'AUTH' instead of 'AUTH CAPTURE'. Then you'll later have to manually 'capture' the payment in the Orders->View/Manage Orders section in the admin. Note that this may also require that you have the appconfig 'StoreCCInDB' set to 'true'.
About Steve Gray
Steve is a seasoned (translate: old) developer in VB and ASP.NET. He spends most of his time in Dynamics GP, writing custom mods for consulting firms. Crystal reports, eConnect, VS Tools for Dynamics... anything that comes along.