On Fulfillment by Amazon's Privacy Page you can request and collect all the privacy and GDPR related information that Fulfillment by Amazon is providing.
The privacy policy by is a legal document or statement that discloses how Fulfillment by Amazon gathers, uses, discloses, and manges their customers' data.
The basis for Fulfillment by Amazon sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.
Subprocessors are companies that provide a service for Fulfillment by Amazon and who has or potentially will get access to personal data of their customers.