I've seen enough users hitting this issue that I did some digging and found answers. Here you go!
From the [url=http://www.bungie.net/en/View/Bungie/DestinyBetaFAQ]FAQ[/url]
[quote]Q. I’ve already pre-ordered. Where can I locate my Destiny Beta code that I redeem on Bungie.net?
Thank you! If you pre-ordered on October 1st, 2013 or later, the code is either printed on the receipt, on a flyer you should have received at time of purchase, or sent to you via email through a retail rewards program.
The code is 9 digits in the following format: XXX-XXX-XXX
The timing for the delivery of your code varies by retailer. If not instantaneous, you’ll receive your code in the weeks before the Beta test begins.
[b]PlayStation Store digital pre-orders and participants in Japan do not require a beta code or registration process.[/b][/quote]
You should be able to see your digital down load available if you preordered on the PSN store.
[b]SONY REP[/b]: You can go here, sign in with your PSN account and start the download:
[quote] https://store.sonyentertainmentnetwork.com/#!/en-us/games/destiny-beta/cid=UP0002-CUSA00756_00-DSTYBETACERTPS41[/quote]
[b]In the console you can follow this route:[/b]
[quote]PS Store and go to Games > Destiny > Beta or Games > Demos > Destiny. You should then see an option to download the beta.[/quote]
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Ok so if you go to the link provided by the sony rep: https://store.sonyentertainmentnetwork.com/#!/en-us/games/destiny-beta/cid=UP0002-CUSA00756_00-DSTYBETACERTPS41 Then add the beta purchase then click to download the beta to your ps4 it will download and work