My apologies for the confusion. In a campaign, you can only get the daily budget via the
Amount metric as I have previously said. You cannot get the total running budget on a campaign via the
Campaign Performance Report. However, you can get the account's total budget using
BudgetOrderService. Check this
guide for more information regarding this.
In regards to the total spent/cost of a campaign, the Campaign Performance Report will automatically sum your
cost based on your date range. For example, If your date range is a one month range, then the Cost metric will return the total of your one month cost for that campaign.