Need guidance on creating REST Connection for Primavera Cloud

We tried to create REST Connection for OPC using basic authentication and it got configured. But while using it in OIC Integration, it is throwing 401 Unauthorized error.

And we are able to test REST APIs using bearer token but on the REST adapter, we donot see the option in the security policy for bearer token. Max it shows is OAuth. So need direction how will we be able to configure the REST connection for OPC.