Libertex Group is an online brokerage firm with over 3 million clients worldwide and 400 employees from over 20 nationalities. The document discusses how Libertex leverages smart events for CPA app campaign optimization. Specifically, it outlines how using custom events to track meaningful user actions allows campaigns to optimize for cost per acquisition rather than return on ad spend. This provides more applicable metrics for measuring success across verticals. The document also describes how filtering users by quality scores and adjusting bids accordingly can further improve campaign performance at lowering CPA.