We added support for PC Charge in version 6.0 (for processing credit cards with your own merchant service), but initially recommended it only for certain customers in case there were issues. So far it has been much more reliable and easier to get working than IC Verify, so we now whole-heartedly recommend PC Charge instead of IC Verify.
The only issues we've seen are when one or more steps in our instructions is skipped, so it's extremely important that you follow our PC-Charge integration documentation to the letter, including the specific settings in PC Charge -- even if their support tells you it should be set a different way.
Any recent version of PC Charge Pro or PC Charge Payment Server will work (5.10, 5.09, etc), as long as it's not too old (we have not tested with versions released earlier than 2011).
One caveat is that they don't yet support Windows 8. Hopefully this will be remedied soon.
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