Final answer:
Oracle Identity Management (OIM) is the recommended interface for managing user roles and approval workflows for customers with only Financials Cloud licensed.
Step-by-step explanation:
The recommended method for entering users and assigning roles in Financials Cloud for a customer who only licensed Financials Cloud and wants to use approval workflows is by using the Oracle Identity Management (OIM) interface.
This interface is part of Oracle's overall security and identity strategy, and it enables administrators to manage user roles and access rights for Oracle Cloud services. By navigating to the OIM, administrators can create user accounts, assign predefined roles to users, and manage workflow approvals within the Financials Cloud environment.