Google云平台 - 我需要一个webhook来获取JSON数据。如何接近它？

I am fairly new to the google-cloud-platform world and I am struggling with my 1st steps there. So, what I want to know is how to make a webhook app, that will run 24/7 and "catch" data sent from another 3rd party service (later I will try to do something with this data - manipulate it and push into a DB, but that's anohter question to ask). I have set up an instance on GCP which Linux based, but , what's next? I am familiar with PHP, but I want to do it this time in Phyton (learning it nowdays). Which service in GCP should I use and how I set up the server to catch every data the 3rd party service is sending?I am fairly new to the google-cloud-platform wo