Refund Test
Trigger a Stripe refund via the Worker. You can refund by PB Session ID (preferred) or by PaymentIntent ID (manual).
If you enter a PB Session ID, the Worker will look up the PaymentIntent ID from your Google Sheet (via GAS),
then apply the 24-hour refund policy check, then refund.
Leave this blank if you’re refunding by PB Session ID. If you do provide it, it must start with
pi_.