If you're running both channels, you already know the headache. Shopify Admin tells you one story, Amazon Seller Central tells you another, and neither one gives you the full picture without a lot of squinting and copy-pasting. So how do I unify my Shopify and Amazon sales data without losing a day every week to spreadsheets? Short answer: pull both sources into one place, normalize the numbers, and stop trying to eyeball two dashboards side by side. Here's what that actually takes.