[Zen Cart] Hack To Assign Permissions As With Other G2 Modules

I have edited the g2 zencart module to introduce a permissions system as most other modules have.

Previously every visitor to your site could add items to zencart but with this mod, you can assign permissions as usual.

Please note that this only applies to while browsing your g2 site and does not stop them from adding any items while on the zc pages if they know the url or you allow navigation within zc.

Back up your original Module.inc
Upload the attached version
Go to SiteAdmin -> Modules and run upgrade.
Set permissions

Hope someone finds it useful.
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