Wrong order means PMAX bleeds into Search. This invisible data problem costs Shopify owners real money β budget misallocated by 30-50% to the wrong campaign type. You cant fix what you cant see. Have you checked whats inside your Paid Search channel lately?
The fix: Use campaign naming conventions to separate them. PMAX = pmax or cn prefix. Shopping = shop or pla. Branded search = tagged clearly. Then build custom channel groups in this order: 1) PMAX first, 2) Shopping second, 3) Paid Search = what's left.
So what do you actually do? Use campaign naming conventions: Name PMAX campaigns with pmax or cn prefix. Name Shopping campaigns with shop or pla. Keep branded search tagged clearly. Then build custom channel groups in this exact order.
I dug into GA4 source code to understand exactly how this works. GA4 maps Google Ads campaigns using three fields your custom rules cant see: Source platform, Ad network type, Campaign type. Custom groups only get: Source, Medium, Campaign Name.
The result in practice:
β’ You see "Paid Search ROAS: 4.2x" π
β’ You scale budget to Search
β’ But 60% of that bucket is actually PMAX with a 2.1x ROAS
β’ You just scaled the wrong thing
This is happening right now in stores spending $10K+/month on Google.
Here's a GA4 problem I see in almost every Shopify store running Google Ads:
Your "Paid Search" channel includes PMAX, Shopping, and Display β all lumped together.
One ROAS number. Three completely different campaign types.
Your Paid Search ROAS is a lie. π§΅π
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