Just made an extension for shipping and payment methods restriction. ( on newest version - 18.104.22.168 works great ).
To test it on older magento versions, tried it on 22.214.171.124 and on 126.96.36.199 . In both versions when I go to my own made tabs under system->config, it returns 404 page error. I have no idea why and where to look, as I’m not familiar with magento versions differences.
Maybe there is some difference in making tabs under system->config in different magento versions?
If you want to see some code example, just tell and I’ll post.
Thanks in advance.