I’m ready to get a clean, end-to-end tracking foundation in place and need an expert to finish the job across both my website and mobile app. Everything must run through Google Tag Manager, feed into GA4, and tie back to Google Ads and Merchant Center for remarketing. Here’s exactly what I need done: • Deploy a single GA4 Configuration tag in GTM and verify that enhanced measurement is capturing page views and button clicks without duplication. • Add the full GA4 eCommerce event set (view_item, add_to_cart, begin_checkout, purchase, etc.) so revenue and product data flow into my reports. • Create Google Ads conversion tags and import them properly into the Ads account, ensuring they fire only once per transaction or lead. • Implement dynamic remarketing parameters that match the Merchant Center feed, making sure user, product and transaction IDs sync correctly for audience building. • Mirror all critical tags in the mobile app container (Firebase-linked) so data from app and web rolls into the same GA4 property. • Test everything in GTM Preview/Debug, confirm real-time hits in GA4, and supply a short handover document with tag names, triggers and variables used. Completion will be accepted when GA4 real-time shows the expected events from web and app, conversions appear in Google Ads with correct values, and Google Tag Assistant surfaces no errors.