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- OTP — one-time password: a short code that works once and expires quickly.
- Flow — a place where codes are used: login, signup, checkout, contact change.
- Channel — how the code travels: email, SMS or WhatsApp.
- Route — one channel through one provider, for example SMS via your SMS provider.
- Failover — sending the same code on the next route when the first one fails.
- DLT — India's registry for business SMS senders and templates. Required for SMS to +91 numbers.
- Validity — how long a code works before it expires.
- Resend window — the period in which the number of codes requested is counted.
