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The CPA Playbook

For Shopify brands & performance marketing managers · 25 min read · Free

A 7-chapter guide for Shopify brands on why CPA rose +19% YoY in ecommerce, how iOS ATT collapsed Meta's attribution window from 28 to 7 days, and how to rebuild signal quality using first-party data from your Shopify store. Covers CPA diagnostics, ROAS and AOV optimisation, and the Shopify data flywheel. Clustie clients using this framework saw −27% CPA, +63% ROAS, and +20% AOV.