LPT: If the PS Store is being ridiculously slow and you have codes to redeem, you can redeem them from your web browser on a computer and they will be added to your library in purchases on your PS4. You can then download from there.

Just did that for Jak and Daxter when the store did not absolutely want to load for me, now I have the game downloading as well as a bunch of other updates lined up for the night. Can sleep in peace and wake up tomorrow with games to play. :-)