Universal WhatsApp OTP for Any Platform
Streamline user authentication with secure, instant One-Time Passwords delivered via WhatsApp. Integrate SendZen's API with your preferred platform, language, or SDK for a superior login experience.
Why WhatsApp for your OTPs?
Leverage the world's most popular messaging app for enhanced security, improved deliverability, and a seamless user experience that SMS can't match.
Superior Security
Benefit from WhatsApp's end-to-end encryption for a more secure OTP delivery channel.
Higher Deliverability
Overcome SMS blacklisting and improve delivery rates, especially in international markets.
Global User Preference
Meet your users on their preferred messaging platform, simplifying their login experience.
WhatsApp: The Global Preferred Choice for OTP
WhatsApp isn't just another messaging app; it's often the primary communication channel, making it ideal for critical authentication and an essential fallback when traditional SMS fails.
Primary Communication Channel
For billions worldwide, WhatsApp is the default messaging app. Deliver OTPs directly where users already spend their time, reducing friction and increasing successful authentications.
Critical SMS Fallback Solution
Combat network coverage issues and unreliable SMS delivery. WhatsApp serves as a robust fallback, ensuring your users receive their OTP even when traditional channels struggle, vital for global user bases.
Navigating Regulatory Hurdles
In regions like India, complex DLT approvals make SMS delivery challenging. WhatsApp offers an immediate, compliant, and user-friendly alternative to get your OTPs through, accelerating your market entry.
Seamless International Roaming
European travelers frequently face SMS delivery issues due to roaming. WhatsApp bypasses these limitations, providing consistent OTP delivery across borders and ensuring uninterrupted service for your global users.
How It Works: Simple & Fast
Getting started with SendZen for WhatsApp OTP is quick and straightforward, regardless of your tech stack.
Sign Up & Get API Key
Instantly get your API key with our generous free tier for developers.
Get StartedChoose Your Integration
Select your platform or language from our diverse range of SDKs and guides.
Send OTP via API
Call the SendZen API or use our SDKs to send a templated OTP message.
Verify & Authenticate
Your application verifies the OTP entered by the user to complete authentication.
Integrate WhatsApp OTP, Your Way
SendZen's flexible API and comprehensive SDKs mean you can implement WhatsApp OTP on virtually any platform or with any programming language.
AWS Cognito
Secure your AWS-powered applications with WhatsApp OTP. Seamlessly integrate SendZen as a custom message sender for your Cognito User Pools.
Auth0
Extend Auth0's authentication capabilities with WhatsApp. Use our API to send OTPs for login, password resets, and MFA flows.
Any Language / Framework
Integrate directly with our REST API using Java, C#, PHP, Ruby, Go, or any other language for full flexibility.
Don't see your platform? View all integrations or contact us for custom solutions.
Quick Start with Our Sample Code
Jump straight into coding. Our SDKs and examples are designed for rapid development. Copy, paste, and customize.
Find detailed setup instructions in our documentation
View DocumentationStart Building for Free, Today
Join thousands of developers who trust SendZen for their WhatsApp OTP authentication needs. Get started in minutes with our generous free tier.
600 Free Messages
Start with 600 WhatsApp messages per month, absolutely free. Perfect for development and testing.
Instant Setup
Get your API key in minutes and start sending OTPs immediately. No complex configuration required.
Enterprise Security
Bank-grade security with end-to-end encryption. Your users' data is always protected.
No credit card required • Setup in 5 minutes • 24/7 support
Frequently Asked Questions
Have questions? We have answers. If you don't see your question here, feel free to reach out to our team.