Master Seat credentials can be used to retrieve Line-level performance across associated Sub-Seats.

For example:

GET /rtb/metrics/line?sub-seats-only=true

Using sub-seats-only=true with Master Seat credentials returns Line-level metrics for the Master Seat’s associated Sub-Seats.

Because Lines belong to Campaigns within each Sub-Seat, the returned data can be used to report performance by Sub-Seat, Campaign, and Line without switching the authenticated session into each Sub-Seat individually.

This is useful for Master Seat integrations that need to aggregate reporting across multiple Sub-Seats from a single authenticated session.

For example, a Master Seat reporting workflow can:

1. Authenticate using the Master Seat credentials.
2. Request:

/rtb/metrics/line?sub-seats-only=true

3. Use the returned Seat, Campaign, and Line identifiers to separate or aggregate performance by Sub-Seat.

This approach is recommended for cross-Sub-Seat reporting when Line-level metrics provide the required level of detail.