Conversion tracking via the Conversions API and pixel, analytics integration through a UTM taxonomy, and incremental-impact measurement with geo-holdout tests. The LiveRamp CAPI Hub connection arrived in June 2026 and automatic advanced matching became the default in August, and at the end of September one-day view-through reporting and Insights API reporting on conversions beyond the campaign goal followed; on 5 October 2026 Hightouch and Tealium integrations, ten attribution partners such as AppsFlyer and Triple Whale, and geo-based incrementality experiments with Haus, Measured and WorkMagic were announced. Setup guides for these partners and for mobile measurement partners such as Adjust, Airbridge, AppsFlyer, Branch, Kochava, Singular and Tenjin are live in the OpenAI Help Center. With OpenAI's October 2026 product update, the Conversions page in Ads Manager was redesigned with event-quality recommendations and Diagnostics warnings, and advertisers with active campaigns now receive a weekly performance summary. The incrementality work is still early and there is no in-platform brand lift, so we complete that layer with our own measurement design.