SMS OTP — One-Time Password Service
Secure your web applications, banking portals, and e-commerce platforms with SMS One-Time Password (OTP) verification. Fast, reliable, and easy to integrate via iSMS API.
One-Time Password (OTP) Explained
One-Time Password (OTP) is a single-use password sent to the user's registered mobile number for secure account access. It is also known as two-factor authentication (2FA). Internet banking portals use OTP to verify user transactions — protecting against password sniffing, replay attacks, and identity theft.
OTP uses two main techniques to generate passwords:
- Time-Synchronisation: The password is only valid for a short period of time (e.g. 60 or 300 seconds).
- Mathematical Algorithm: A new, random password is generated using secure algorithms each time it is requested.
SMS OTP Process — Step by Step
OTP codes are sent to the registered mobile number only. iSMS service is protected by strong security protocols.
User Requests OTP
User clicks "Get OTP" on your website or app.
Backend Verification
Request sent to your backend server for validation.
iSMS API Call
Your server calls iSMS API with the OTP message and mobile number.
User Receives OTP
User receives the OTP code via SMS on their phone.
Access Granted
User enters the code — once verified, access is granted.
Integrate SMS OTP into Your Application
Register free and use the iSMS API to send OTP codes in seconds. Code samples for PHP, Node.js, Java, C#, VB.net, ASP.NET and C++.
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