Using a custom Google Analytics code with Buy Button
Saw something similar here: https://ecommerce.shopify.com/c/ecommerce-marketing/t/buy-button-google-analytics-sales-tracking-327738
but the answer doesn't actually give any information.
My question is, can one add custom GA code to the checkout page that customers a directed to when you use the 'buy button' method of selling on shopify? The second link from the answer to the above question does contain some info about linking accounts cross-domain, but says nothing about getting the GA code into the shopify checkout page. What I'm looking for is something analagous to the 'Google Analytics' section of the Preferences tab on the 'Online Store' section of a shopify admin, but in the 'Buy Button' section instead.
Is it possible to get some custom GA code onto the buy button checkout page?