Full Answer

Client-side tracking is deceptively easy to start. Paste a JavaScript snippet into your theme header, and GA4 begins recording page views. Install a Facebook pixel plugin, and purchase events fire in the browser. The initial setup takes minutes. The hidden complexity emerges over time — debugging Data Layer issues, managing consent mode interactions, reconciling discrepancies between pixel-reported and actual conversions.

GTM server-side tracking multiplies this complexity. You need a GTM web container configured with Data Layer variables and triggers for WooCommerce events. You need a separate GTM server container hosted on cloud infrastructure like Stape or Google Cloud App Engine. You need to configure tag-to-tag communication between web and server containers. Then inside the server container, you configure individual tags for each destination — GA4, Facebook CAPI, Google Ads — each with its own payload format, authentication, and deduplication logic. The minimum viable setup requires 40–80 hours of GTM expertise.

WordPress-native server-side tracking simplifies this because it operates within the environment WooCommerce store owners already know. The inPIPE plugin captures events at the PHP hook level — woocommerce_payment_complete, woocommerce_add_to_cart — without any GTM configuration. Destination setup happens in the WordPress admin: enter your GA4 Measurement Protocol secret, your Facebook access token, your Google Ads conversion action ID, and your BigQuery project credentials. Events start flowing to all destinations from a single configuration interface.

The operational difference is who maintains the system. GTM requires GTM expertise for every change. WordPress-native tracking requires WordPress expertise — which the store owner or their existing developer already has.