How to make a field optional in REST API connection's Request Wrapper?

Summary:

The OIC integration is intended to handle REST API calls and invoke Oracle Cloud ERP adapter to create a supplier.

I created a REST API connection as a trigger and configured sample JSON request. The fields names have asterisks, to my understanding which means all fields I put in the sample JSON are mandatory.

How to make a field optional?

Content (required):

As tested, when I send HTTP request without "AlternateName", the integration returns "401 Unauthorized" and fails at REST API connection.

The Tracking Fields "Supplier" and "TaxRegistrationNumber" were not recorded even I provided valid values in the request body.