Shopify to GA4 Purchase Tracking: Transaction ID QA

Self-directed Shopify Partner QA sandbox — not client work. Problem: GA4 recorded the sandbox purchase, but the Shopify transaction_id needed a reliable path into the GA4 ecommerce event for order-level reconciliation. Work: Added a GTM data-layer variable for transaction_id, mapped it to the GA4 purchase event, and checked a test order in GA4 Realtime/DebugView. The evidence shows one sandbox Purchase and one purchase key event after one test order. Limits: No client implementation or production-wide validation. Item-level pricing still needs separate validation. No real sales, revenue recovery, or ROAS lift is claimed. Related technical reference: https://github.com/muslim-rashdi-ecom/shopify-first-party-measurement-gateway