Push triggers allow you to trigger a workflow by sending a POST to https://api.relay.sh/api/events with a workflow-specific token, for example:

export TOKEN=... # get this from the web app
curl -X POST -H "Authorization: Bearer $TOKEN" \
  -d '{"data": {"message": "This is a push event"}}' \
  https://api.relay.sh/api/events

Read more at https://relay.sh/docs/using-workflows/using-triggers/#push-triggers