You must be on the Company plan to connect to the Zapier API.
Click on your user profile icon, and choose Settings:
Under Security, choose User Provisioning:
Copy and paste the SCIM Bearer Token into Trelica:
When creating users, you may get the message:
Provisioning failed: Cannot save the username as it has a different domain than any of the account domains.
This is typically because you are creating a user with an unregistered domain. To register a domain in Zapier, go to Security and click Add Domain. You will need to prove ownership of the domain (e.g. by connecting to Google or modifying DNS entries). Zapier will guide you through this process.