Secure FTP gets with a v5r1 iSeries

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I've got a requirement to get small files of hotel reservations from a
travel agent on an hourly basis using secure ftp to my production iSeries.
Get's only.

I think we've got all the necessary software in place, the last piece being
IBM Digital Certificate Manager awaiting installation.  I just called
Verisign to see about getting a certificate and am now officially confused.
(I may have been unofficially confused before and to ignorant to notice).

Has anybody done something like this?  The files will contain credit card
numbers and I want them protected.  Verisign says it doesn't secure ftp.
I've got IBM instructions on how to do this from a Redbook, but it just says
"do so now" about the getting the cert stuff.

System's an 820 on v5r1, it's behind a firewall and proxy set up.

TIA for any guidance.

Tom Westdorp
Station Casinos