I decided to explore something similar to a Webhook for Google Forms. In other words, something that triggers another action when a Google form is submitted. In this case, when a Google form is filled and submitted, the results should be sent to an API endpoint for adding members to a database. I found an answer in Google Apps Script, a coding language based on Javascript which allows for programmatically extending Google Apps like Google Forms, Sheets, Docs etc.
A nice explanation of how triggers can be used in Google Forms to push new data to other systems. The post is easy to read and includes lots of screenshots to help prevent you getting lost.
