how can we confirm if IDCS users are used in VBCS application or VBCS has its own user creation ?

Summary:

how can we confirm if IDCS users are used in VBCS application or VBCS has its own user creation ?

Content (please ensure you mask any confidential information):

We have few integration users in VBCS with basic auth, need to confirm if these are coming from IDCS?

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

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