Let a support agent issue refunds, up to a ceiling you set
You want the agent to finish routine refunds without a person re-clicking each one, and never past an amount you control.
A synthetic test run of the Refund Card on KIFF's production services, no customer data: three refunds authorized against its balance, requests with no card or larger than what remained refused, the owner raising the ceiling, and the next attempt stopped once the card was revoked. Every decision has its own signed receipt.