Implementing Self Service Procurement without Core HCM

Summary:
Implementing Self Service Procurement without Fusion Core HCM

Content (please ensure you mask any confidential information):

How do we implement SSP for an organization that isn't implementing Fusion HCM but integrating with a third party HR Software.
Asking in terms of users, since SSP involves the workers in the organization.

Version (include the version you are using, if applicable):

25A

Code Snippet (add any code snippets that support your topic, if applicable):