Zapier integration to fetch Item updates and write to a Google Spreadsheet

I am trying to make a Zap that allows me to fetch item updates and write them to my google sheet. I have no trouble on writing when an item is first created in the board according to set criteria. What I am having trouble is literally writing the update itself. Zapier asks me for a pulse id or something similar. Yet, I could not figure out how to get this for item updates (if it even exists). Can someone help me with this?