spend value in UI and from API is different

DELVE Media 1 Reputation point

I am pulling data from Microsoft ads API for KeywordPerformanceReportRequest. I always have only 0.0 values in spend, but clicks and impressions are the same as in UI. There is no filter in the code for sure. What could be a problem?

The report columns are:

Microsoft Advertising API
Microsoft Advertising API
A Microsoft API that provides programmatic access to Microsoft Advertising to manage large campaigns or to integrate your marketing with other in-house systems.
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