Question; How to handle Google's conversion underreporting (tROAS)

Hey everyone,

I'm trying to figure out the right Target ROAS to set for my PMax feed-only campaign, but I'm running into a tracking discrepancy that makes it hard.

I'm using Trackbee as my primary conversion source (server-side via Shopify). The problem is that Google consistently shows fewer conversions than Trackbee, because Google can only attribute conversions when a gclid is present.

What makes it even harder is that the gap between Google and Trackbee is not consistent. Some days Google catches most conversions, other days it misses a lot — which makes it impossible to apply a reliable correction factor when setting a tROAS.

is there another approach to deal with this inconsistency?

Thanks!

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Question; How to handle Google's conversion underreporting (tROAS)