Bree has setup a campaign in Amazon DSP which utilizes a deal ID.Whatsupply is she leveraging?

Bree is leveraging Private Marketplaces (PMPs). A deal ID is a unique identifier used in programmatic advertising to facilitate transactions between a specific buyer (like Bree's campaign) and a specific seller (publisher) for a defined inventory at negotiated terms. This setup is characteristic of PMPs, where publishers offer premium inventory to selected buyers, often at a fixed price, outside the open exchange. Amazon Publisher Services (APS) is Amazon's header bidding solution for publishers to maximize yield, but it doesn't directly define the deal ID mechanism for a specific campaign as PMPs do. Third-party exchanges are open marketplaces where inventory is bought and sold via real-time bidding, typically without pre-negotiated deal IDs for specific inventory.