Adding the Amazon sales channel
Before you start using the Amazon sales channel, make sure that you have the required accounts and that your Shopify store has the required currency settings. You need a Professional Seller account on Amazon Seller Central, with selling on Amazon.com enabled
Adding the Amazon sales channel is free, but you'll need an Amazon Professional Seller account to use it. You'll be charged $39.99 per month by Amazon, plus a referral fee based on your product's category.
Your Shopify store needs to list prices in USD to be eligible for the Amazon sales channel.
Activate the sales channel
You can add the Amazon sales channel from the App store or you can activate it directly from your Shopify admin.
To activate the Amazon sales channel:
From your Shopify admin, click the
+button beside the Sales channels heading.
In the Amazon by Shopify section, click Learn more:
In the Amazon dialog, click Add channel to confirm:
On the Amazon account page, click Connect to Amazon.
Follow the prompts to allow information to be shared between your Shopify and Amazon Seller Central accounts. When you're done, you'll be redirected back to your Shopify admin.
If you don't have existing UPCs for your products, then you can look for other services that let you purchase them.