How to register a file in modx? What do you mean "run this code in the snippet"?

I need to add the possibility of delivery, for which I have a ready API.
The manual says that you need to zaregat this file so that it is displayed in the class-handler. So the question is, what means "This code must be run 1 time in the snippet on the page"?
June 26th 19 at 14:14
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