Is it possible to use orchestrator api to remove a schedule?

I want to issue this web request from a robot.
Or, is there any standard activity that can provide this functionality?

Never tried but may be yeah,
Use this link for reference
https://orchestrator.uipath.com/reference#schedules-requests

Yes: https://platform.uipath.com/swagger/ui/index#!/ProcessSchedules/ProcessSchedules_DeleteById

You can use the HTTP Request activity.

YES, using Orch API calls, just FYI use GET Schedules from Orch Swagger then follow the same arguments to remove any specific schedule, it is the easiest way…