How to customize Strapi backend (content-manager) controllers, services and validation?

Hello ! :slight_smile:
As v4 is now live, I’m trying to do the same things as @aminta : customize core controllers called in the content-manager.
I tried the different solutions discussed above but it doesn’t seem to work…
Is there a way to extend core methods called in the content-manager for v4 ? :thinking:

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