

When an order is created, Cryptorefills locks in a token amount based on the exchange rate at that moment. The 20-minute window is how long that locked rate stays valid, since crypto rates fluctuate continuously. If a payment arrives after the window closes, it can't automatically be matched to the order.
The order has expired and the payment address is no longer valid. Sending funds to it after expiry means they may arrive on-chain but won't be matched to an order. Create a new order instead, which generates a fresh rate and address. The expired order carries no obligation, no funds were involved.
If a payment was sent before the window closed but confirmed on-chain after, the situation is recoverable. Contact Cryptorefills support with the transaction hash and order number so the payment can be matched to the order.