I would like to synchronize our library management system (OLIB) with our Amazon's account in order to keep track of our bought eBooks. Is that even possible? The closest I've got is Amazon's Product Advertising API:
https://affiliate-program.amazon.com/gp/advertising/api/detail/main.html
However it seems to work with Amazon's product list but there is no mention about how to access my account to manage my purchased Kindle eBooks.
Short answer, no. There's a slightly longer answer at a related question, https://stackoverflow.com/a/12905025/1251108.
In general Amazon does not seem interested in exposing customer purchase history.