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YOUR USER INFORMATION
Please check your profile (http://www.u2.com/profile) and the TOUR page (http://www.u2.com/tour)... If you are eligible to receive a code, it should be there...
If your are certain you should have it and it doesn't appear, please contact the customer support service, either by filling the CONTACT US form in the HELP page (http://www.u2.com/help) or by calling them [(855) 867-5297 (inside the US) | +1(949) 333-4820 (outside the US)]