Google Analytics loses the link between a customer choosing a product, checkout, and payment. Littledata fixes this by linking together the session that the customer had browsing the products with the actual payment
If you’re not using the Littledata app, transactions will be attributed to direct even though you see site traffic by channel. It will come through as Direct which means that the user who made the purchase is your URL into their browser or using a bookmark to directly access the website.
After you install the Littledata app you'll be able to see that the sessions will link together. This is done through Shopify's backend so the accuracy for volumes and transactions will be 100%. You’ll start seeing transactions being attributed to different channels. You'll be able to see ratios as well as how many of them end up converting.