Hello Vanja, The Account Performance Report <https://developers.google.com/adwords/api/docs/appendix/reports/account-performance-report> will return metrics at the account level, hence this is matching with the metrics on the Campaign tab in the UI. On the other hand, Keywords Performance Report <https://developers.google.com/adwords/api/docs/appendix/reports/keywords-performance-report> is generated at the keyword level with one row per keyword. The Cost in the Keywords Performance report will be the total cost for the keywords equivalent to the Cost in the Keywords tab. Hence Cost <https://developers.google.com/adwords/api/docs/appendix/reports/account-performance-report#cost> in the Account Performance Report is not equivalent to the Cost <https://developers.google.com/adwords/api/docs/appendix/reports/keywords-performance-report#cost> in the Keywords Performance Report. You may refer to this guide <https://support.google.com/adwords/answer/1704424?ctx=tltp> on how total cost are calculated in the account.
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