You will earn the Special Program Fee Rates described in this Section 4(b) in connection with “Trade-In Events” which occur when (1) a customer clicks through a Special Link on your Site to an Amazon Site and (2) during the resulting Session the customer adds a product to his or her trade-in shopping cart and then submits a trade-in request that Amazon accepts.
Be sure to check what kind of customer support you can expect from your affiliate program once you have signed up. Do your research online and if possible, speak to other sellers using the program to get their thoughts. Can you speak to someone via phone or Skype or do you have to wait 72 hours for email responses? Be clear on this because trust me, you will need support at one point or another.