Condition-gated paywall, checkout, retention, referral, and monetization-awareness patterns sourced from published A/B test case studies (abtest.design / Mobbin). Routes structure to vois-patterns, copy to righter, and instrumentation to metrics-tagging. Use when a ticket touches paywalls, trials, checkout, upsells, streaks/habit loops, or referral flows. Not a rulebook — every entry is a single validated hypothesis, not a universal law.
