Login to your Let's Calendar Admin account.
Step 1 - Navigate to Settings -> Zoom Integration

Step 2 - Click on "Connect Zoom" Button

Step 3 - Sign in to your Zoom Account

Step 4 - Please accept and provide necessary permissions,
Ensure you click on the Checkbox - Allow this app to use my shared access permissions
Click on Allow Button to grant access to Let's Calendar and continue the integration

Step 5 - Confirmation! Zoom app is now connected!

Now you can add your meeting/webinar ids in campaigns to automate Zoom Flow.