How to Trigger UIPath Process externally with UnAttendant BOT and Without Using Orchestrator

Hello Team,

We urgent requirement for our project.

We have unAttendant Bot and Studio. But No Orchestrator.

We want to invoke UIPath Process externally from different system on demand basic. Lets say user click on the button on my website, I want to invoke UI process.

Please help.

Thanks
Rajkiran.