Can previous date's cost values in performance report change?

[Alperen Belgic]

Hello, 

Sorry if this was previously asked, I tried to find but I couldn't, maybe because I am not very familiar with the terminology. 

I will be importing cost values per campaign per day daily. 

In the early morning, let's say at 6 am, a process will get previous day's cost values and import into the system to provide derived reports. (Campaign Performance Report)

1) Is it possible that a cost value for a campaign in a previous day is recalculated and changed in Google Adwords database?

2) If the answer for 1) is yes, how many days back I should re-import the values that I previously imported into the system? This is to make sure that I import the finalised value which will not be changed again. 

3) Also, when could it be the earliest time I can get previous day's cost values? This question is not related to the previous ones, I just want to know if I can get data before 6 am? 

Thank you very much, 

Alperen Belgic

[Milind Sankeshware (AdWords API Team)]

Hi Alperen,

In general, the performance stats(Cost, Clicks, Impressions) are not available immediately. In most cases, the account statistics (such as clicks, conversions and impressions) are delayed by less than 3 hours. However, some metrics and reports take longer to process or are only calculated once a day (rather than on a continuous basis). This guide on data freshness should be helpful for better understanding. If is possible that adjustments to the stats are made at a later date as well. One possible solution is to rerun the reports are regular periods like, end of a week or end of a month and check for any updates during that period and record the updates at your end. The stats are available at 3 am PST time each day. I hope this will help you. Let me know if you have any further questions. 

Thanks,
Milind, AdWords API Team