The Refund Agent will not refund until the carrier confirms the return. The Shipping Agent will not create a return label until the refund is approved.
Most engineers think a leader election "picks the best node." It doesn't — it gets every node to agree on the same node, and agreement under failure is consensus.
When you press Enter in Slack, the message does not travel over the WebSocket your client is holding open — it goes out as a separate HTTPS POST to chat.