A one-time password (OTP) code arriving by SMS on a mobile phone lock screen, with a feature phone showing the same code

What Is an OTP? How One-Time Passwords Work (2026 Guide)

OTPs, Developer Guides /

What is an OTP? Learn how one-time passwords work, the types (SMS, TOTP, HOTP), why they matter for security, and how to deliver OTPs reliably in Africa.

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