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The discrepancy in total transaction value in GA4 when using the measurement-api to send e-commerce transactions can be due to numerous reasons. One could be a delay in data processing or reporting on GA4. There could also be a difference between how GA4 and Analytics Universal handle or interpret transaction data. Data filters, sampling, or discrepancies between server and browser times could also contribute to the difference. Furthermore, discrepancies may be caused by differences in currency conversion rates if your transactions involve multiple currencies. Other potential issues could be related to how refunds or chargebacks are reported, or even how different platforms classify and report on unique versus repeat customers. It might be beneficial to involve an analytics expert or Google Support to get to the bottom of this.
