You can buy extensions from the online Magento Marketplace (marketplace.magento.com) and they appear in your Composer repository for download (repo.magento.com), but how does this work behind the scenes? Why do I need to go through Marketplace to get free extensions, but not to get Magento Community Edition (CE)? And why does Magento Enterprise Edition (EE) appear only after I pay? This post describes the relationship between the Marketplace online store, the Composer repository, and the entitlements that link the two.
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