Upgrading plugin to NopCommerce 4.30

Hi. I'm looking for a guide to upgrade our custom plugins to NopCommerce 4.30.

Can somenone indicate  me a document or a post where lo look for?

Thanks in advance.

I don't think there is any guide.
Do a Diff (e.g. using KDiff or similar) of some similar core plugin - diff the code in old version vs. the code in new version, to see what changes they made.  Then try to apply those types of changes to your code.

Thanks in advance. I Will try .