Shopify to Amazon Product ID

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I currently sell products on my shopify site that I get wholesale from Alibaba (not Alibaba express). However, I don't have any product ID for these items. I'm wondering how I can finish my listings or where I can find any ID that Amazon is looking for. What is the process for selling on Amazon when you have the product on hand and you also have these products up on your site? Please help. Thanks!