I am currently in the development and testing stage of working on an ecommerce site using nopCommerce 4.20 and would like to upgrade to 4.30. My client planned on using Square to process payments during checkout. Can I use the Square Plugin from 4.20 in the 4.30 version?
Probably not, because of the upgrade to the libraries it was compiled with. You can try... edit the plugin.json file in the plugin's folder, and modify to "SupportedVersions": [ "4.30" ],
But I think you'll get an error when you run the site.