Do we need OAuth integration to support OAuth for inbound CPQ REST calls, managed package in use?

We have enabled Dynamics CRM integration on the site and there is a requirement for CRM to invoke REST API calls into CPQ outside of the provided managed package. To support this, CRM will be using an integration user to invoke the REST API calls and needs to authenticate their session. This integration user does not have an active CRM license to use the user token so do we need to setup OAuth integration as well to support OAuth for inbound REST API calls?