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This version works with 0.30.1. You DON'T want to pull this into master. Pull it into it's own branch for 0.30.1 since this version will not work in Spree 0.11.x.
NOTE: I have not modified the paypal_express_callbacks_controller.rb so this will not work with 0.30.1. The reason is that I'm not exactly sure how to test any changes to ensure that they are working properly.
Also note: This probably could use a good re-factor, but for now it works so I'm committing it.
Chris