OpenSend docs
Automation Wait for Event Step
Wait-for-event pauses a run until a matching custom event arrives or the wait expires. It is useful for flows such as "send a reminder unless the user completes setup".
Configuration
Use a precise event name and choose a timeout that matches the customer journey. The event should include enough identity information for OpenSend to match it to the waiting run.
Troubleshooting
If runs never resume, confirm the application sends the exact event name to the same tenant and that the automation runner is processing waiting runs.