I have implemented eCommerce tracking through analytics. All the code is implemented correctly but we are missing many orders showing up. On inspection it seems as though these are all the orders done through PayPal. We have added referral exclusions for PayPal on the analytics account but this does not seem to have solved the problem. We have been working with conversion tracking experts at Google who assure us that the code is all correct. Is this a problem which other people on the Shopify platform have had and is there a quick solution?