I tried to pull data from our app campaigns.
q_campaign = ('''
SELECT
campaign.resource_name,
campaign.status,
campaign.serving_status,
campaign.ad_serving_optimization_status,
campaign.advertising_channel_type,
campaign.advertising_channel_sub_type,
campaign.tracking_url_template,
campaign.advertising_channel_type,
campaign.advertising_channel_sub_type,
campaign.experiment_type,
campaign.base_campaign,
campaign.campaign_budget,
campaign.bidding_strategy_type,
campaign.start_date,
campaign.end_date,
campaign.final_url_suffix,
campaign.frequency_caps,
campaign.video_brand_safety_suitability,
campaign.payment_mode,
campaign.bidding_strategy,
campaign.manual_cpv,
campaign.maximize_conversions,
campaign.target_cpm,
campaign.app_campaign_setting.app_id,
campaign.app_campaign_setting.app_store,
campaign.app_campaign_setting.bidding_strategy_goal_type,
metrics.impressions,
metrics.clicks
FROM campaign
WHERE segments.date DURING LAST_30_DAYS
''')
the value of campaign.campaign_budget is 'customers/xyzxyz/campaignBudgets/xyzxyz'
xyzxyz == number with 10 digit.