To track customer journey across channels with Shopify, you need to connect Shopify's order data to every other platform a customer touches before buying, including ads, email, SMS, and organic search, then stitch those touchpoints together by customer identity rather than by session. Shopify shows you what happened at checkout. It does not show you the ad someone saw three days earlier, the email that brought them back, or the second device they switched to before converting. Founders who only look at Shopify's native reports are working from a fraction of the real journey, and that gap leads to marketing decisions based on incomplete data.