[Help]VeriFone Integration

Hello All,

As most of you know I am making a POS System for my dad and I am trying to find a good virtual merchant to process the credit cards. My dad has Elavon - Home as his merchant... Elavon supposedly supports VeriFone so I've been snooping around their website to find some kind of SDK... I do, but I cant find the dll that needs to be integrated anywhere... (here is the pdf of the sdk thingy... http://www.verifone.com/PDF/PCCharge...WhitePaper.pdf )
Does anyone know where is the dll or if there is another way to process credit cards in vb by going through VeriFone or Elavon?