Well, I'll start writing the credit card validation module now. Apparently, the docs for the system are buried in a download (one of three). One download is the MainStreet Credit Verification Engine (MCVE). The second download is the C API, and the third download is the Perl API. The Perl API was a laughable joke with no documentation. I wasted a few of hours going through their site, searching newsgroups and searching the Web in general trying to find this damned documentation. Turns out the the docs I needed were an HTML document in the C API download. Naturally, my C is pretty rusty, but this stuff is really easy to read.
Incidentally, during the seach, I discovered, amongst other things, that there's a Yahoo! group for MCVE: "mind-control victim's experiences". I decided not to read anything in that group.
Test count: 689.