Credit Card + SSH

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I am providing a shell hosting service, and I want to know if there
are things I have to be concern when I accept credit card information
by having someone login to a special account in one of our servers
using ssh client (e.g. PuTTY).  I will be writing a signup shell
(ncurses-based) to be used instead of bash, csh, sh, ksh, etc.  With
regards to security, what are the advantages and disadvantages.

Thanks in advance.


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