How to protect yourself from automatic code changes in WordPress and the like?

Question

HTML

In general, I have already channeled this wordpress. I will
make, for example, a form of payment on my server.
I'll show the customer - everything is cool, I like everything I
insert the code through the WP editor, and this asshole starts wrapping my tags in <p>, putting <br>, just inserting empty <p></p>
Well, in general, embedding a form takes more time than creating it
How to prevent this need with editors?
It is necessary to prevent locally, i.e. maybe there are some ways to wrap your code in a special tag and then WP will not touch what is in the tag?

Answer 1

wrap in shortcode, for example.

Answer 2

wpcrux.com/disable-wpautop