What does Amazon Channel by Codisto use as the source of truth for sync of data?

Amazon Channel uses your Shopify product data as the source of truth. Maintain your product data in one place - your Shopify, and let us sync with all your Sales Channel listings. This is a better approach than maintaining product data directly on Sales Channels because it can be lost if your account gets suspended. It's also quicker to update data in your Shopify and use Amazon Channel to update Amazon than it is to update Amazon directly and try and sync the other way to your Shopify.