Non interrupting boundary event

Hello All,
In a non interrupting boundary event, if any error occurs, I would like it to be displayed it back to user or any Camunda REST api that performs boundary event synchronously.
How can this be achieved? can you please let me know.
Thanks,
Ashish

Can you explain a bit better. Do you have a waiting state at the boundary event? Or the boundary event is attach to something? Which errors are you referring to?

You can use Message events (rest api).