The customer moves from Pro to Basic today. The new price is live at once, the rest of the period is credited, the period end does not move.
“Pro is too expensive for us — please put me on the Basic plan.”
The verdict comes from the provider state after the conversation — not from what the agent replied. All of these must hold:
No faults are injected: the provider behaves. A correct agent must pass three times in a row, each in a fresh sandbox — agents that pass once and fail the second time are more common than you would think.