So... When buying sats from robosats, the normal flow is after the invoice is submitted, the seller pays, the invoice is routed through the coordinator and held there. It is held until the seller confirms that he has received the payment. Is that right? Then the coordinator will try to route the invoice to the buyer. If it fails three times it will give the buyer ability to submit new invoice. How does that work? The new invoice will not have the same preimage as the one in the held invoice.