The usual failure
Placed Order is duplicated, delayed, or missing product data. Every revenue metric downstream is theatre.
What to make true
One clean event. Product, value, customer. Until that is true, do not argue about subject lines.
Worked example
Keep it this plain. A team uses placed order event as if buying the software installed the meaning. It did not. Placed Order is duplicated, delayed, or missing product data. Every revenue metric downstream is theatre. The move is not a new integration. One clean event. Product, value, customer. Until that is true, do not argue about subject lines.