We've been seeing discrepancy in our spend data for clients who are using different timezones other than UTC. We initially thought it was the issue with Criteo API so had reached out their developers team and got responses here: https://developers.criteo.com/marketing-solutions/discuss/616ec02b6fef0d00371d1d52

Looks like we have to use 'Total' for ad-set level reporting instead of summing up the 'Rows'. Also refer to this fivetran ticket (42141). Could you please make this change so we don't see data discrepancy any more? Thanks