import – Need help automating a call to a function from a plugin

I have the Magedelight plugin that does pricing per customer. This is a list that I ideally want to update every 20 minutes, which means I need to automate the process.

I don’t have much Magento backend experience, and I could use help figuring out what function gets called when the import button is pressed.

The way it works is that there’s a button to choose the upload file, and the function gets called when you press “save config”

My end goal is to have this process happen automatically every 15 minutes, and I know I can automate that with Cron, but I don’t know which function to call or how to auto upload and set the file for import