Verify API

WhatsApp OTP Servive

Authenticate users on the spot by sending OTPs via WhatsApp. With WhatsApp, you can boost verification success rates through a channel your audience already trusts.

Documentation

Higher open rates

Reduced spend

What Is WhatsApp OTP?

The WhatsApp OTP (One-Time Password) solution stands to be a secure authentication process entailing the sending of a time-sensitive verification code to clients on WhatsApp rather than on SMS. Organizations use WhatsApp OTP to authenticate user identity when logging in, registering, changing passwords, and engaging in other sensitive transactions. Contrary to what happens with SMS messages, WhatsApp OTP messages are end-to-end encrypted, have the business profile’s brand information, and are sent through the official WhatsApp Business account, resulting in higher rates of delivery and greater levels of user trust.

How WhatsApp OTP Works

A user starts the operation (log in, sign up, or password reset).

The system requires one-time password (OTP) via the WhatsApp OTP API offered by Dexatel.

Dexatel sends the OTP using an authorized WhatsApp authentication template.

The user gets the code directly via WhatsApp.

User inputs the code to complete the verification process.

Dexatel verifies the OTP and assures authentication.

The WhatsApp OTP messages would expire automatically within a set time limit, thus making the problem of reuse obsolete.

WhatsApp OTP vs SMS OTP Comparison Table

Feature	WhatsApp OTP	SMS OTP
Delivery Rate	Very high	Medium
Encryption	End-to-end	No
Branding	Business profile shown	No
Spam Filtering	Minimal	High
Cost Efficiency	Better at scale	Rising costs
Rich Content	Supported	Not supported
User Trust	High	Lower

Businesses switching from SMS OTP to WhatsApp OTP often see improved verification success rates and lower authentication friction.

WhatsApp OTP API Integration

The company, Dexatel, provides a WhatsApp OTP API for businesses to:

Generate One Time Password
Send OTPs via WhatsApp authentication templates
Set expiration times for OTPs
OTP validation should be done securely
Status of delivery and verification

The API has been designed to integrate easily and supports all the popular languages and frameworks.

See Documentation

Why Choose WhatsApp for OTP Delivery

Trusted User Experience

It’s a familiar, reliable, and secure messaging platform used every day by more than 2 billion people.

Branded and Verified Messaging

OTPs are sent from your official WhatsApp Business profile, boosting trust and reducing phishing risks.

Cost-Effective

You can reduce OTP delivery costs in regions where SMS is expensive. Plus, you only pay for delivered messages.

Key Features

Intelligent Fallback

If WhatsApp fails, Dexatel’s system automatically switches to SMS, Flash Call, or Voice, guaranteeing OTP delivery.

Easy API Integration

Our developer-friendly API and SDKs make integration simple, with detailed documentation and 24/7 support included.

Secure Authentication

OTP WhatsApp messages are time-bound, tamper-resistant, and fully encrypted for safe login and transaction validation.

Delivery and Engagement Insights

You can track sent, delivered, and read statuses in real-time and optimize performance using full analytics.

Multi-Channel Flexibility

Our platform supports multiple communication channels, including SMS, Viber, and Telegram—all within one API.

Global Reach

Authenticate users across more than 190 countries, with region-optimized delivery and built-in compliance.

Getting Started With WhatsApp OTP

Sign Up

Create your free Dexatel account—no credit card needed.

Connect WhatsApp

Link your WhatsApp Business Account in the Dexatel dashboard.

Verify With Meta

Our team will guide you through the Meta verification process.

Create a Template

Submit a pre-approved WhatsApp authentication message template.

Integrate the API

Use our API or SDKs to send OTPs with fallback logic and delivery insights.

Set up WhatsApp OTP verification in just a few steps.

Get Started Now

Use Cases For OTPs via WhatsApp

Account Registration

New users can be authenticated at the point of sign-up using a one-time password sent through WhatsApp. This goes a long way in blocking the formation of fake accounts and bots.

Password Reset

Verify the credentials of the user before allowing a password reset by providing a secured OTP via the use of the Whatsapp service. The use of the Whatsapp service limits the vulnerability of account takeover.

Transaction Verification

To further enhance security and prevent financial fraud, safeguard payments, withdrawals, and other high-value transactions on WhatsApp by using a WhatsApp OTP to verify every transaction.

Two-Factor Authentication (2FA)

Improve account security using an additional login layer for users made possible by the combination of passwords and WhatsApp OTP. This is much safer and still allows for quick login access.

Profile Updates

The changes that are sensitive in nature, like email IDs, phone numbers, or account settings, will be validated by sending an OTP on WhatsApp to ensure that only the account owner makes changes to his/her profile.