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There are REST APIs available for configuring campaigns. What do you mean by 'campaign loading'?
If you meant 'enabling campaign', then you may invoke PUT on the API
http://<server>/adminapi/campaign/{id}/state/{enable or disable}.
If you meant 'importing contacts', then you may invoke POST on the API
http://<server>/adminapi/campaign/{id}/contacts.
You may refer to '
campaign' section of Express Configuration API Guide for more information.