Full Answer

ChatGPT's mobile app uses a built-in WebView to open ad clicks rather than handing them off to Safari or Chrome. This WebView applies the same kind of privacy restrictions that make Facebook, Instagram, and TikTok in-app browsers problematic for marketers — third-party cookies are limited, JavaScript execution is sandboxed, and standard pixel fires often fail silently without returning errors.

The practical impact is straightforward: your Meta Pixel, Google Ads tag, and any JavaScript-based conversion tracking you've added through GTM or a WooCommerce plugin won't fire reliably when the purchase happens inside ChatGPT's browser. You'll see the sale in WooCommerce, but your ad platform won't register the conversion — which means your ROAS reporting understates reality and your campaign optimisation suffers.

Server-side tracking solves this by removing the browser from the equation entirely. Instead of relying on a JavaScript pixel to fire in the user's browser, a server-side setup sends the conversion event directly from your WordPress server to OpenAI's Conversions API endpoint. The browser's restrictions are irrelevant because the data never passes through it. The same principle applies to [Meta CAPI, Google Ads server-side, and every other platform](https://seresa.io/blog/chatgpt-ads-pixel/chatgpts-in-app-browser-blocks-your-woocommerce-pixel) that offers a server-to-server path.

For WooCommerce stores testing ChatGPT Ads, getting [server-side tracking in place before spending](https://seresa.io/blog/woocommerce-tracking/before-you-spend-on-chatgpt-ads-the-woocommerce-tracking-health-checklist) is the single most important prerequisite. Without it, you're flying blind on the fastest-growing AI ad channel — spending budget with no reliable way to measure what's working.