OTP SMS Explained: Secure User Verification with One-Time Passwords

OTP (One-Time Password) SMS is a security mechanism that delivers a unique, time-sensitive code to a user's phone number. This code is used to verify the user's identity before granting access to a system, completing a transaction, or confirming an action.

How OTP SMS Works

1. User submits their phone number to your application
2. Your system requests an OTP from the SMS gateway API
3. The OTP is delivered to the user's phone within seconds
4. User enters the code to complete verification

Why OTP SMS is Preferred Over Email OTP

Phone numbers are more reliable identifiers than email addresses in Bangladesh. SMS reaches users instantly even without internet connectivity, making it ideal for mobile-first markets.

Implementing OTP SMS with Zan Communication API

A single POST request to our API delivers an OTP in under 3 seconds. View our full API documentation for integration code in PHP, Python, and JavaScript.