I'm also from the AdWords API team and I'll be providing support for now. For retrieving AdWords Express campaign information, you may refer to the steps mentioned by Sreelakhsmi on how to get them. The
blog post should provide the details on how to achieve this and you can also use the
CampaignService.get() if you do not wish to use the Campaign Performance Report.
Should there be any issues, feel free to write back.