Full Answer

The mobile conversion gap isn't a mystery once you look at the checkout flow side by side. On desktop, the full WooCommerce checkout fits above the fold on most screens — billing, shipping, payment, and the order button are all visible. On mobile, the same form becomes a vertical scroll that can run eight or more screen-heights long. Every additional scroll is a friction point, and mobile visitors are far less patient than desktop users.

Express checkout options narrow the gap dramatically. Stores that add Apple Pay, Google Pay, or Klarna see mobile conversion lift of 20–35% because they collapse the entire billing-and-payment form into a single biometric tap. But here's the tracking problem: most WooCommerce stores can't accurately attribute which payment method produced which conversion. Client-side GA4 tracking misses a portion of mobile transactions entirely because in-app browsers and privacy-focused mobile settings suppress the tracking JavaScript.

Server-side event tracking solves the attribution blind spot by capturing the purchase event at the server level, regardless of the visitor's browser or device settings. That data clarity is what turns a vague 'mobile converts worse' observation into an actionable picture of which checkout paths work and which leak revenue ([WooCommerce tracking](https://seresa.io/blog/woocommerce-tracking/)).