Stay on the order page for a minute. It waits for the network to issue the eSIM and updates itself when it does, which normally takes under a minute.
If you gave an email address and the page is gone, check that inbox, including the spam folder.
If more than a few minutes have passed with nothing on the order page, write to us with the order number. If we cannot issue the eSIM at all, the order is cancelled and the payment released or refunded in full.