Your question is Secure Checkout Flow (Frontend). Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain how you would implement a secure checkout flow from a frontend perspective at Crunchyroll.
Discuss the browser and application architecture, payment-provider integration, authentication and authorization boundaries, protection of sensitive payment data, validation, redirect and failure states, and accessibility. Explain how the frontend should communicate with backend checkout APIs without trusting client-controlled values. Address how you would test, monitor, and safely roll out the implementation.