How to use Login Service to get Security token for REST Webservice in Integration Repository EBS R12

Hi,

We are on EBS R12.2.7  version. We have enabled REST Service in Integration Repository and deployed Out of the box Web services.

We have shared EBS login - Username,Password & context information like respId, respApplId, securityGroupId,orgId with which the requestor wants to intialize the underlying EBS session.

We are able to call REST Webservice from 3rd party successfully.

For security reasons we do not want to share username,Password. We want to know how to  use Login Service to generate Security token.

What else is required to share to 3rd party for them to generate security token.

Thanks,