You can use Google Script to create JSON Web Tokens (JWT) that can be provided to secure routes so that only authenticated requests that contain a valid token can connect to the APIs (e.g., the Zoom API)
Nice little snippet from Amit Agarwal for both creating and decoding JSON Web Tokens (JWT).
Source: How to Create JSON Web Token (JWT) with Google Apps Script – Digital Inspiration
Member of Google Developers Experts Program for Google Workspace (Google Apps Script) and interested in supporting Google Workspace Devs.