In that case, I would recommend keeping the Campaign ID / Ad Group ID -
Keyword mapping saved in your local database. You can first perform a basic
check on whether an ad group / campaign exists before performing updates on
the keyword. Multiple sanity check actions can be grouped into a single
operation with a batch job, to optimize the performance. Also, you can set
header to true so that the operations that fail would be ignored.
Vishal, AdWords API Team
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