Governing Next.js Phone Verification Login SMS OTP Resends in Production

In Next.js applications, SMS OTP resend functionality should be managed by the backend as an admission-control mechanism, not a client-side timer. The server must track challenge states, provide masked destinations and retry metadata, and only create sessions after successful verification. This approach prevents abuse by controlling resend logic and verification attempts based on risk and service level objectives, ensuring a secure signup process.

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