How to properly obfuscate an opencart plugin?

Question

PHP

There are a fairly large number of plugins for opencart. You need to obfuscate the code.

The problem is that plugins call parent methods (properties) of the CMS system and the system expects to see certain methods (properties) in the code of this plugin.

Is there any solution how to make obfuscation, and not “spoil” these methods (properties), except for how to mark up with pens what to obfuscate and what not?