GA4 Ecommerce Attribution & Tracking Expert (Magento 2 + PayPal)

Overview I am looking for an experienced Google Ads / GA4 tracking specialist to audit and fix conversion attribution issues on a Magento 2 ecommerce website. This is NOT a campaign optimization project. I am not looking for someone to change bids, keywords, budgets, or ad copy. I need someone who specializes in analytics, conversion tracking, attribution, and ecommerce measurement. Website Magento 2 Google Ads Performance Max Google Analytics 4 Google Tag Google Ads Conversion Tracking PayPal checkout Current Issues The website records purchases correctly, but attribution appears inconsistent. Examples include: Google Ads reporting significantly fewer conversions than actual orders. GA4 previously attributing purchase revenue to "(not set)". Large swings in reported ROAS that do not appear consistent with actual sales. Known checkout issue that has already been fixed, but attribution still needs to be verified. Need to confirm that purchases are correctly attributed back to the original Google Ads click. Scope of Work Please perform a complete audit and fix any issues found. This includes, but is not limited to: Google Ads conversion tracking GA4 ecommerce implementation Purchase event implementation Enhanced Conversions Google Tag configuration Cross-domain tracking PayPal checkout attribution GCLID preservation Session continuity during checkout Consent mode (if applicable) Duplicate or missing purchase events Attribution between Magento, GA4 and Google Ads Deliverables Complete audit report. List of every issue found. Explanation of each issue. Fix all identified tracking problems. Document every change that was made. Verify that conversion tracking is functioning correctly. Provide recommendations for any remaining improvements. Acceptance Criteria The project will be considered complete when: Purchases are consistently tracked in GA4. Google Ads conversions are correctly recorded. Attribution from Google Ads clicks to purchases is functioning correctly. No obvious attribution issues remain. Documentation of all changes has been provided. Important Please describe: Similar Magento 2 projects you have completed. Your experience with GA4 ecommerce attribution. Your experience debugging Google Ads conversion tracking. Your experience with PayPal checkout attribution. How you would approach diagnosing this problem. Please do not apply if your primary expertise is Google Ads campaign management. I am specifically looking for someone with deep experience in analytics implementation and attribution troubleshooting.