SMS OTP Resend in Node.js: Message IDs, Backoff, and Delivery Errors

Implementing SMS OTP in Node.js requires treating resends as state transitions of the original message ID to prevent uncontrolled code streams. This approach ensures proper tracking of pending or failed states. For property-management contact forms, SMS OTP-based 2FA should remain within the authentication boundary. This separation ensures that identity verification proves phone number control for short transactions, while the verified form payload independently determines the business queue for maintenance, leasing, or resident-account support services.