在Shopify上设置GA4的方法有几种。
方法1：通过google channel
方法2：通过GTM
目的：为了跟踪从page view 到最后完成purchase的所有events. 事件events包括，
View product lists (collection pages, category pages, home page)
Select an item from the list
View product details (item details)
Add or remove products from the cart
Begin (initiate) checkout process
Complete the purchase
Executes a refund
Use promotions & coupon codes
