How to access amazon api?

Question

API

Tell me how to get access to the amazon api, how much does it cost in general and what to do step by step?
I just tried somehow, but there it’s like $ 50 first, then give me a site on which you work with our goods.
In general, maybe I misunderstood something ...
Somehow I don’t want to immediately pour in money while the project is being written, tested ...

Answer 1

So it was not possible to get access to the API. I need to get data on a book by its ISBN-10.
Do you really need to pay? and then you pay and it's not that.