Синхронизация данных о конверсиях

A steady 30% gap for two weeks straight isn't a bug, it's two different counting rules. Pull one day's raw orders from Shopify and hand-match them against the ad platform's conversion list before you say another word to the client. Usual suspects, in the order I'd check them: (1) attribution window - platforms default to 7-day click/1-day view and count the conversion on the click date, Shopify counts it on the order date, which alone will skew a growing account 20-30%; (2) modeled conversions - post-ATT, a chunk of what the platform reports is statistical, not observed; (3) dedupe - if you fire both pixel and CAPI without a shared event_id you double count, if the IDs mismatch you get inflation on one side; (4) Shopify's own analytics uses last non-direct click, so it hands paid social's…

Thanks, appreciate the input. Im actually building a solution and im debating the architecture with myself. I currently send calls and forms to a google sheet via zapier and my client will upload sales from their closed CRM. We do a matching process via name and or phone number to the call logs then send the sales values to google ads as offline conversions. It works but its convoluted.