Using Composer
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You can use composer to install the SDK, because DWW, also amaintainer of that module, created a repository.

Install Amazon SDK manually
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You can also  manually download the official amazon php sdk first! That is what i do, marcoka
Download here: https://webservices.amazon.com/paapi5/documentation/quick-start/using-sdk.html

Keep these folders
amazon_pa/amazon_sdk/src
amazon_pa/amazon_sdk/vendor
The other files can be deleted. Delete everything from the vendor folder except the composer folder and the autoload.php!

Place them into the libraries folder so you have a structure like
/libraries/amazon_sdk/vendor/autoload.php

It also can be placed inside the modules directory itself
Create a directory "amazon_sdk" inside the "amazon_pa" folder and place the lib here.
Should be accessible like this: "/amazon_pa/amazon_sdk/vendor/autoload.php"
