Hi Alex, Thanks for confirming. To your question, you can use either ADD or SET to add <https://developers.google.com/adwords/api/docs/guides/extension-settings#adding_ad_extensions> / update <https://developers.google.com/adwords/api/docs/guides/extension-settings#update_ad_extensions> extensions. I can check with my team and let you know more on the purpose of their existence as two operators (and not one) and why the batch job behaves the way it does. Myself or somebody from my team will get back to you soon.
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