SMS OTP Provider Design Emphasizes Application Control Over Carrier Status

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A technical article advises designing SMS-based OTP verification for gaming without relying on provider webhooks. The core principle is that the authentication service, not the SMS carrier's status, must own all security decisions and state management. This includes enforcing code expiry, attempt limits, and maintaining an immutable audit trail of all actions. The design treats SMS delivery status as an informative observation, not a command that can alter the validity of a one-time code. This approach ensures system correctness even when SMS messages are delayed or arrive out of order.

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