Retrieve the revenue attributed to a campaign, one row per currency, plus whether revenue is tracked for it at all.

Attributed revenue is a lifetime figure, so this endpoint takes no date window and no paging. Amounts are integers in the currency's minor unit (for example 129900 for 1,299.00 USD); v1's preformatted total_revenue_formatted string is not carried, so format the amount yourself.

Currencies with no attributed revenue are omitted, so revenues is an empty array for a campaign that generated none.

Requires the Campaigns feature and access to the campaign; a campaign the user cannot see is reported as 404 so the endpoint does not disclose which campaign ids exist.