Performance Max Reporting

Google Ads API Adds Video and PMax Product Costs on June 15 — No Backfill

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On June 15, 2026, the Google Ads API expands product-level reporting to return cost and conversion metrics for Video, Demand Gen, App and Performance Max campaigns — previously only impressions and clicks. Historical API requests for dates before June 15 will not contain the expanded data: there is no backfill. The change lands inside a 15-day window with two other Google Ads policy shifts (the June 1 37-month retention cap and the June 10 v20 API sunset), forcing WooCommerce stores into a connected dashboard rebuild. May 2026 and June 2026 will not be apples-to-apples for the affected campaign types.

Most PMax Search Themes Spend Budget on Queries You Already Win

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Google’s January 7, 2026 Performance Max update expanded the per-asset-group search theme cap from 25 to 50 and shipped a usefulness indicator labelling each theme Useful, Limited Usefulness or Not Useful. Most WooCommerce stores filled the new 50-slot cap with brand variants and category terms — and the indicator is now exposing that the majority duplicate queries PMax would have found anyway, while paying for traffic they win organically. The indicator is computed on GA4 conversion data, which 73% of SMB implementations misconfigure. The most reliable signal is an incrementality query against your own BigQuery extract, not Google’s internal score.

Your PMax ‘Search’ ROAS Was Mostly Search Partners All Along

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Google launched a Performance Max channel performance timeline in early April 2026 and broke out the Search Partner Network as its own line, separate from core Google Search. For most WooCommerce stores, this will reveal that a meaningful share of their PMax “Search” ROAS was Search Partner traffic with very different economics. The transparency upgrade is real, but it’s wasted on leaky data: standard Google Ads conversion tracking misses 30-50% of conversions in 2026, and PMax’s true incremental ROI is 4.64x — 2-5x below the platform-reported number per analysis of 253 MMMs covering $383M of spend (Cassandra Benchmarks, 2026).

Your PMax Asset Group ROAS Is Calculated on Half Your Conversions

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Google’s expanded Performance Max asset-group reporting tells WooCommerce stores where their budget went — but the ROAS Smart Bidding optimizes against is calculated from the conversions Google could see, typically 60-80% of true revenue. The eight-hop tracking chain (browser, network, consent state, JS execution, plugin hook, server, payment redirect, attribution window) leaks 20-40% of conversions before they ever reach the asset group. The fix is a three-number weekly reconciliation: WooCommerce orders by source, PMax conversions, GA4 source/medium — closed with Google Ads Offline Conversion Import and server-side first-party tracking.

Google Opened the Performance Max Black Box. You Still Can’t Act on It.

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Google’s April 2026 Performance Max updates — the Channel Performance Timeline, the Final URL report, asset-level actual metrics, a 10,000-keyword negative list — are real progress. For the 1 million+ advertisers running PMax globally (Dataslayer, 2026), the black box is genuinely cracked open. But for a WooCommerce store owner, the transparency stops at the same … Read more