Import configuration from wlp file API

I want to copy the configuration of a unit to other units by means of the API, I have seen that there is a method to export the WLP file exchange/export_json&params={"fileName":<text>, "json":{}}  and a method to import itexchange/import_json&params={"eventHash":<text>}

I have doubts as to how to pass the id of the unit that i want to copy the configuration.

I use the api with php

Anyone has used this method?

Thanks