Shopify's native route to Amazon is Marketplace Connect, Shopify's own app for listing products on marketplaces from the Shopify admin. You create Amazon listings from Shopify products inside the app, and inventory stays synced afterward, with Amazon orders flowing back into Shopify for fulfillment. The main work is listing setup: Amazon has category-specific attribute requirements that Shopify's product fields don't cover, so expect to fill in extra attributes or match existing Amazon catalog entries. It needs an Amazon Professional seller account. Pricing is free for the first 50 synced orders a month, then 1% per synced order, capped at $99 a month.
Note: We've identified 3 known limitations with this integration.
See known limitations below for details.