What is the use case? Note that when you share the admin credentials (encrypted or not) with the third party, he can do a lot more than just add bulk users.

We have third party group who usually handles L1 requests like adding/importing users to JAZZ Applications.

Due to security policy, we can't give JAZZ admin access to third party group anymore. It need to be managed internally now.

I am checking the possibilities if there is any way we can add users without revealing password or credentials.

Any thoughts here....API or any custom solution?

Thank you

When you say "without revealing password or credentials", I assume you are referring to the password or credentials of existing admin users?    You of course would never want to reveal passwords or credentials of existing admin users to third parties.