PS Product SecurityKnowledge Base

💸 Signup, Trial, Promo, and Business-Flow Abuse

Intro: This class of abuse is often dismissed as fraud-adjacent noise until it becomes a board-level cost line. Product Security should help product teams identify which workflows are easy to script, chain, or arbitrage.

What this page includes

  • common abuse patterns around growth and monetization features
  • controls that do not ruin the product experience
  • what to monitor by actor, object, and workflow
  • how to prioritize fixes using business impact

Repeating abuse themes

  • account farming for free tiers;
  • coupon or referral abuse;
  • invite-chain or workspace proliferation abuse;
  • API budget exhaustion through deliberately expensive workflows;
  • abuse of trial reset or account deletion and recreation patterns.

Control ideas

  • bind entitlements to stronger identity than email alone;
  • monitor by household, device, payment instrument, workspace pattern, and not only by account;
  • make high-cost workflows scarce and observable;
  • separate user friction from fraud friction by using progressive challenge models.

Product Security role

The goal is not to own fraud. The goal is to help product teams see when a workflow grants too much authority or too much economic value without enough identity confidence or monitoring.

Author attribution: Ivan Piskunov, 2026 - Educational and defensive-engineering use.