Why final-click billing is the safer CPC event for gamified ads

Gamified ad pages create several useful signals before a visitor leaves the game. A game_link_view tells you the page loaded. A material_impression tells you a prize or offer was shown. Those signals are valuable for optimization, but they should not drain advertiser budget.

LootAd treats final_click as the primary billable event because it is closest to user intent and can be deduplicated with campaign, session, click, and prize context.

Exit popup clicks can be billable when configured, but they use the same idempotent billing path so retries do not create duplicate charges.