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Placement. A registered position in your surface where Adgentek ads may render. Configured in the dashboard, referenced in your integration. Surface. The environment where your users interact: a chat app, an AI search interface, an article page, or an agent runtime. Impression. A verified, client-side render of an ad. Billable only when the impression pixel fires from a real browser or app context. Impression pixel. A tracking URL included in the ad payload, fired as an image request from the client when the ad renders. The event that makes CPM demand billable. burl (billing notice URL). A server-side notification fired on impression receipt. The only legitimate server-side tracking event in the Adgentek stack. A burl is a billing notice, not an impression; it does not qualify a surface for impression-priced demand. GIVT (general invalid traffic). Traffic classified as invalid by verification vendors based on identifiable signatures, including requests originating from datacenter IP space. Impression events fired server-side are classified as GIVT and discarded. This is why impression tracking must be client-side. Demand tier. One of the four sources in the waterfall: Direct, Programmatic, CPC, API/CPA. See Demand sources. Intent bucket. One of nine classifications of the user’s intent for the current turn, from Purchase to Entertainment. Determines demand eligibility and format selection. See Intent classification. Derived signal. The privacy-safe data transmitted to demand partners: IAB categories, keywords, intent bucket, entity types. Raw prompts and transcripts are never derived signals. Engaged session. A session where the user interacts with an ad unit at least once, for example tapping a chip in a Spark unit. Spark. Adgentek’s flagship conversational ad format: an interactive Q&A unit where the user explores a brand’s knowledge inside a single card. See Ad formats.