Revenue origin ID is used for some integration connections.
Where to Find My Revenue Origin ID
Plans with Affiliates only
You can access your Revenue Origin ID directly in the platform settings.
Go to Settings
Click on "Your Trackdesk identifiers" in the top right corner
It is revealed by using the Reveal button.
As Network Client
As network client, each advertiser has a different Revenue origin ID and it can be found on the advertiser detail in the Advertiser list, section Advertiser ID.
Or in the Offer Postback/Integrations section where the Revenue Origin ID is relevant for the tracking, specific of the advertiser owning the offer.