First-order effects

• Toss gains a rapidly growing payment credential layered onto its already broadly used app, while FacePay users can pay at a large existing retail footprint without presenting a physical card.
• Participating merchants must support FacePay at checkout, making biometric authentication an operational part of the in-store payment experience rather than a limited pilot.

Second-order effects

• Card issuers, wallet providers and other payment platforms face pressure to match FacePay’s convenience and merchant reach, or to reinforce the reasons consumers and retailers should retain card-based checkout.
• As payment activity moves through Toss’s app and merchant network, its adjacent financial products—such as banking, credit, insurance and investments—have more opportunities for customer engagement, while merchants gain another channel whose economics and data practices they will need to evaluate.

Third-order effects

• If usage keeps scaling, South Korea’s payments market could shift from plastic-card credentials toward app-based biometric identity, concentrating more of the consumer checkout relationship in platforms that control both authentication and financial services.
• The broader adoption of face-based payment would make trust, consent, fraud controls and the handling of biometric data enduring competitive and policy issues; the available coverage establishes growth, not whether FacePay will displace cards on Toss’s stated timetable.