Bungie check your forums.
People are posting ways to obtain the RedBull codes without purchase by creating their own codes.
All this does is deny honest folks who buy RedBull the code.
Edit- By the way I'm in the UK so cannot purchase a code, and I still think this is wrong.
Saying "oh but it says no purchase necessary" is not permission to create your own code. It simply means another person is able to purchase a can for you to use the code.
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Thanks for the tip