So your product is a referral to Amazon, and they won't even give you api access to build their referral funnel? That doesn't sound like much of a business partner.

You get access to Amazon's product API only after showing a certain level of success as an affiliate.

oh gosh no, love books, building it for free. We are direct funded with premium accounts by authors and readers.

You might be out of luck: I believe they expire unused after a fairly short time.