The activation code is not received
You should receive the registration code to the email used with your order as soon as your order is completed. If your credit card payment is immediately confirmed (for most cases it is), you should see the registration code on the confirmation page as well.
You may receive an email that your order is currently processing. It means that your payment will take a little longer to process due to various reasons.
If it has already been more than a couple of hours since you placed your order, please send an email to firstname.lastname@example.org (please email from the email used with the order). It could be that your email provided for the order has a typo.