https://www.ibm.com/docs/en/ims/15.3.0?topic=sdcar-authorizing-dbrc-commands-api-requests-dspdcax0-exit-routine
IMS 15.3 - System administration - Authorizing DBRC commands and API requests with the DSPDCAX0...
You can use the DBRC Command Authorization exit routine (DSPDCAX0) to verify that a user is authorized to issue a particular command or API request.