Amazon SDK
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You need to manually download the official amazon php sdk first!
Download here: https://webservices.amazon.com/paapi5/documentation/quick-start/using-sdk.html

Create a folder "amazon_sdk" insided the amazon_pa folder and place the sdk there. The structure the should be
amazon_pa/amazon_sdk/src
amazon_pa/amazon_sdk/vendor

The other files can be deleted.
