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See http://www.standajilek.cz/skripty/ke-stazeni/import-nakladu-do-google-analytics/ to get started
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Replace the original script with https://github.com/martinbottanek/google-apps-scripts/blob/master/sklik/cost-data-import.gs if you need campaign-level cost data
ATTN: Sklik JSON API is still beta and doesn't return costs for content campaigns