This error comes up when we do not detect your payment in the time window assigned for your invoice. When we quote a price in BTC, we can only honor that price for 15 minutes due to its volatility.
If you have sent the payment but your invoice expired, please keep that screen opened and as soon as we detect it, you will be able to request a refund for your payment.
If you have not sent your payment yet, you can create a new order.
For further assistance, please contact our support team with the Invoice ID and transaction ID for your payment.