Tutorial: How to push data in a Google Sheet via “API”

This is a creative solution! You can also create a proper HTTP API using Google Apps Script and expose it to the web:

https://developers.google.com/apps-script/guides/web

This allows you to parse all kinds of payloads, including ones not specifically tailored to your app. For example, I wrote a script that could receive webhooks from PayPal and record them in a spreadsheet.