I am in the process of calling Okta API for Authentication "Primary Authentication" as shown in the pic below and I tested this using post man and it was working as expected with proper response.
I am trying to integrate this API call out with APEX by making use of "Web Source Modules" (APEX version 19.2) as shown below
There is no Authentication required by this API as it is open. I am unable to discover the service and I am faced with error "405 Method not allowed" when I try to test the POST operation. Thanks to anyone who can help me in this regard.