Amazon Associates Gift Card Question

Hey guys, I got a lame question. Recently I've started to experiment with amazon affiliates and build a couple of sites. Most of them are page 2 (nothing special) but today I've received an email from Amazon Associates with 8$ gift card. I've logged in my dashboard but there is no sale. The question is, from where this 8$ gift card came?

i also need amazon and itunes gift card,if you can office contact with me