We understand this situation can be upsetting. Sometimes there can be a delay before keys are added to your inventory. The first thing we recommend is to reboot your system. If this does not work and it’s been more than a few minutes please contact us, so that we can investigate the issue further.
If you are using a PS4 and made the purchase in-game try the following:
Select (Settings) > [PlayStation™Network/Account Management] > [Restore Licenses].
If you are using a PS4 and made the purchase through your web browser remember that the region of the store and the game client have to match. If you are unsure, contact us and we’ll help you figure it out. If you know that the regions do not match, contact Sony directly to discuss their policy on how to handle this situation.