Hi there,
I have checked TrackingMore guide you attached and I will be happy to help you.
We can create a Google Apps Script and deploy it as a web app to act as a webhook. It will receive POST requests from TrackingMore, parse the request body and update the spreadsheet.
I believe that you want to monitor the packages in the spreadsheet, like when a package is arrived, TrackingMore will send a webhook request to indicate that the package has arrived, and you want the script to find that package row in the spreadsheet and update the status column to arrived, just imagining, but I believe that it will be close to that.
Previous experience related to the project: I have worked on projects that involved creating webhooks using Google Script to receive data from Acuity scheduling, CallR, Typeform and others.
I will be happy to address any of your questions!
Sincerely,
Mohamed