For Coinbase, all invoices generated after the confirmation of order should be paid within 10 minutes. There is a countdown on the invoice page to remind you the remaining time. If you can't send the BTC within 10 minutes, the invoice will expire automatically.


For BitPay, all invoices generated after the confirmation of order should be paid within 15 minutes. There is a countdown on the invoice page to remind you the remaining time. If you can't send the BTC within 15 minutes, the invoice will expire automatically.


After the invoice is expired, just wait for status of your order on "My Account" page to change to "cancel".


Make your order again when you are ready with your BTC.