Not able to get my head around the webhook option the wait node.
My scenario
I am using n8n to create a new google sheet in a google drive based on a template. Once that is done I want the flow to wait until a section of the sheet is competed and a particular cell is updated, then continue.
I planned on doing this by updating the cell, which will trigger an app script in the google sheets and send a webhook to the n8n wait node in the workflow. When the webhook is received the wait node allows the flow to continue.
This is where I get confused.
In the wait node the url is dynamically generated, so what webhook url do I insert into the app script in google sheets? Obviously I cannot use the webhook token as the app script is outside of n8n.