01 — Request shape
Use the call the application will actually send.
A payload assembled for a demo hides the fields that will break in production. Send the real one, with the real content, once.
Field Notes
What held.
What changed.
Margin
Observed → checked → kept. A note only earns its place here after the second step.
Three notes
02 — Terminal state
A submit response is a beginning, not a finish.
The asynchronous path returns an acknowledgement. Code that treats it as a result will report success on work that has not started.
03 — Evidence
Keep the receipt beside the decision.
A usage record that arrives after the argument is over changes nothing.