Fix Shopify Google Ads tracking gaps with free server-side conversion pipeline

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Shopify stores using browser-based Google Ads pixels miss 20–40% of conversions due to Safari tracking protections, cookie lifespan limits, and ad-blocking extensions. Google's Enhanced Conversions offers a server-side alternative by sending SHA-256 hashed customer identifiers directly to Google's API, which then matches purchases to logged-in Google accounts. This approach recovers attribution even when a user clicks an ad on one device and completes checkout days later on another. Rather than using paid Google Tag Manager server containers costing $10–$30 per month, developers can build a direct webhook pipeline triggered by Shopify's orders/paid event. The middleware hashes customer data and posts it to the Google Ads API endpoint, eliminating third-party infrastructure while restoring accurate conversion data for smart bidding.

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