Hi, I used an online form to refer a friend for the Hilton HHonors Card from American Express. I was to receive 20,000 bonus points per approved referral and they were to receive 40,000 bonus points after spending $750. Now American Express is saying that I should only receive 10,000 unless I have the code. I printed a copy of the page but there is no code. Anybody know that the code or offer number is?