Rules match country, deviceType, bundle — server-side signals that web 6 lacks. Each bidder sees a different imp.bidfloor. Set enforcePBS: false to signal without rejecting — measure bid shifts, then enforce. noFloorSignalBidders hides floors from bidders.
FIELD NOTES
- country uses alpha-3 (USA not US); wrong codes silently miss
- Schema field order sets match priority; leftmost dimension wins
- First request per pub triggers async fetch