Re:PCI-DSS / PA-DSS (Score 2, Informative)

+1 I'm in the EFT field as well, and while it sounds like a fairly simple project, you are in way over your head. It's almost like building a kit car instead of buying a Kia to save money. But there's no kit. And even if you build it, you have to deal with the DMV, except instead of one bureaucratic institution it's a mile long list of processors, credit card companies, and banks who are much much worse.

Now if you said ... "I build and sell closed POS platforms for a living and I want to build and sell a GPL POS platform." You might be in a position where that could happen. Heck I might even help.