Urgent Google Ads Conversion Tracking Troubleshooting – GTM, Consent Mode & WooCommerce

We are looking for a senior Google Ads measurement / GTM specialist to urgently investigate a conversion tracking issue on a WooCommerce store. The problem Google Ads conversions stopped being recorded correctly around August 3. The issue was first identified on August 5. What makes this difficult is that: Google Ads conversion tags appear to fire correctly in GTM Preview / Tag Assistant Conversion requests are visible in Chrome DevTools Network We have seen both successful HTTP responses and some Google Ads conversion request branches returning HTTP 400 The correct Purchase and Begin Checkout conversion actions/labels are being triggered However, conversions are still not being recorded/reported correctly inside Google Ads We therefore need someone who can investigate the entire measurement chain, not simply reinstall tags. Current stack WooCommerce FunnelKit Checkout + One Click Upsells Google Tag Manager GTM4WP / dataLayer ecommerce tracking Google Ads native conversion tracking Enhanced Conversions Google Consent Mode v2 WPConsent CMP LiteSpeed Cache + Perfmatters + additional JS optimization Consent-related changes were made after the issue had already appeared, as part of troubleshooting, so we do not want to assume in advance that consent is the root cause. What we need We want a forensic/root-cause audit of the tracking implementation and Google Ads measurement flow, including where relevant: Google Ads conversion actions and diagnostics GTM triggers, tags and sequencing dataLayer ecommerce events Consent Mode state and consent updates Enhanced Conversions Conversion Linker / click ID persistence (gclid, gbraid, wbraid) Network requests and payloads sent to Google WooCommerce / FunnelKit checkout and thank-you flow Potential duplicate tracking implementations Possible interference from caching or JavaScript optimization Attribution from a real Google Ads click through to purchase Important: We are not looking for someone who only knows how to set up GA4 or create basic GTM tags. We need someone experienced in debugging situations where the tag fires and requests are sent, but Google Ads still does not record the conversion as expected. Ideally, you should be comfortable using Chrome DevTools, Tag Assistant, GTM Preview and Google Ads diagnostics to isolate the problem based on evidence. We already have substantial debugging information available and can provide the relevant GTM configuration, request payloads, conversion labels, screenshots and timeline. Expected outcome Identify the most likely root cause, or narrow it down with evidence. Clearly distinguish what has been proven from what is still a hypothesis. Implement or recommend the required fix. Provide a short explanation of what caused the issue and how we can prevent/detect similar tracking failures faster in the future. This is an urgent project and we would prefer someone who can start immediately. When applying, please briefly describe a similar Google Ads / GTM conversion tracking issue you have personally diagnosed, especially one where the tags appeared to fire correctly but conversions were missing from Google Ads.