You can view your key or code directly in your CDKeys account. If you currently don't have one, please do register for an account.
Then simply log in to your account and click on 'My Orders' tab.
Your orders and corresponding game keys will be displayed on the page.
You can then easily redeem the key / code on the appropriate platform.
If your order/s is not in 'My Orders' try linking the order to your account. This can be found on the 'My Orders' page as well.