Java developer needed for connecting to Amazon API

We would like to have a connector (just the java project with the code) with Amazon API that will give us some information about 5 big reports. We would like to have a Java project that will print the results in the console. The code must be understandable as we wish to maintain it by ourselves after the project is done. We would like to understand all parts of the projects as we have more little companies and want to be able to integrate any time as much companies as we will develop. It is necessary to have all the info about what’s happening in the code, because if in the future will be needed some changes, we want to be able to develop them by ourselves. All reports will be downloaded for days being given with parameters. For example, if I want to call from 6th of December 2018 to 10th, I will call the function giving the date as parameter (‘2018-12-06’,’2018-12-10’). If one of those reports can’t be downloaded via Amazon API then we would like a Chrome extension that will do the work. The reports and the data we want from them are in the attachments.