I recently rehashed the old Skipjack payment module and got that working with the current Zen Cart version. I have tested it and am using it in a live shop on Zen Cart 1.3.9. All instructions and files are including.
ADDITIONAL NOTE: in the instructions it discusses setting up your response files at Skipjack. If you have an ssl installed on your site (which you should), ensure that you use "https" to begin all of response file urls. The included instructions incorrectly list "http" as oppose to "https". If you do not use https, your site with throw a security warning on checkout.
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