I can not add a discount code to ALL of my ebooks (oreilly) in the shopping card as you offer it!
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It could be the limitation of that discount code. Are they all O'Reilly ebooks or are there some from other publishers?
Note: Ebooks published by Wiley, Wrox, Sybex, For Dummies, Visual, dpunkt, and O'Reilly Verlag are excluded from this offer.
Could that be the problem?
O'Reilly Customer Service