I can’t guess that, I use GTM and analytics 98% client-side, to track click conversions, page access, carousel interactions, scroll distance, abandoned carts… when it comes to events such as refunds that may only happen server-side ( email → customer service, etc. ) I expect that would require server-side support. I haven’t tried that with Webflow’s ECommerce solution.
If you’re serious about going deep on that, two things;
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Most server-side integrations I’ve seen are with GA directly. You give them your UA/GA4 code and they push data in through Google’s Analytics API. e.g. My QR code marketing business does that with each QR code scan. Usually, these systems offer integration with either UA or GA4. Rarely both, and you don’t get to choose, so check first.
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GTM has some powerful scripting capabilities, which allow you to do some pretty interesting tracking. You might be able to track things like refunds there, by looking for the right client side behavior - or you might be able to do a Webflow API → GTM API integration to add those events in. Either way, that would be preferable since you can then feed those events to both UA & GA4 in your situation.
Either way you’re talking about a fair bit of customization. You might want to find a specialist who really knows GTM and its capabilities deeply. Unfortunately where GTM’s concerned, I am not that guy.