AWS Cognito WhatsApp OTP Integration
Easily configure AWS Cognito to send One-Time Passwords (OTPs) via WhatsApp for user verification during sign-up or Multi-Factor Authentication (MFA) challenges.
Your Open-Source Edge with AWS Cognito
Our AWS Cognito integration is fully open-source with ready implementation in Node.js and React.js and Next.js Frontend.
WhatsApp Only Authentication
Phone number-based authentication with WhatsApp OTP. Great for authentication use-cases related to B2C mobile applications. Perfect for MFA and SMS Fallback as well.
WhatsApp + Email Authentication
Dual-channel authentication with both WhatsApp and email verification. Enhanced security through multiple verification channels ensuring maximum account protection.
Node.js Implementation
Complete working Lambda functions and backend implementation. Server-side code ready for production deployment with full AWS Cognito custom sender integration.
React Next.js Frontend
Complete working frontend to check end-to-end integration. Pre-built authentication flows and UI components ready for immediate implementation and testing.
Integrating SendZen with AWS Cognito
Our open-source project guides you step-by-step to set up WhatsApp OTP for your Cognito User Pools. Here's the high-level process:
Clone Our Repo
Grab the open-source AWS Cognito Custom Sender code from our GitHub repository.
Go to GitHubConfigure AWS Lambda
Deploy our provided Lambda function (Node.js) as your Cognito Custom Message Sender.
Connect SendZen API
Connect your WhatsApp number and get your SendZen API key to set it in the Lambda environment variables.
Get API KeyTest OTP Flow
Initiate a user sign-up or login to experience instant WhatsApp OTP delivery via Cognito.
Complete Implementation Guide
Follow these detailed steps to implement WhatsApp OTP authentication with AWS Cognito and SendZen. Our comprehensive guide ensures a smooth setup process.
Obtain and Secure Your SendZen API Key
SetupTo send messages via WhatsApp, you need API credentials from SendZen.
Create an account
Register for a free account at SendZen
Register your number
Follow the process to link your mobile number, which registers it with Meta for use with the WhatsApp Business API
Retrieve your API Key
Once registered, SendZen will generate an API key
Store the key securely
It is a security best practice to store this key in AWS Secrets Manager. The Lambda function will be configured to fetch the key from there rather than having it hardcoded
Deploy the Backend Infrastructure
DeploymentThe open-source repository contains a serverless deployment script to provision all the required AWS resources.
Clone the repository
Get the source code containing the Lambda functions and deployment configuration
Run the deployment script
The script automates the following actions:
- Configures the Cognito User Pool: Sets up a user pool to use a custom authentication flow
- Deploys Lambda Triggers: Creates and deploys the five Lambda triggers required for the custom auth challenge cycle
- Links Resources: Associates the Lambda triggers with the Cognito User Pool and grants necessary permissions
Lambda Triggers Deployed:
Implement the Client-Side Logic
IntegrationYour client-side application must interact with the custom Cognito flow.
Initiate the flow
The user enters their phone number. Your application calls the Cognito InitiateAuth API action with the CUSTOM_AUTH flow type. This invokes the "Define" and "Create" Lambda triggers on the backend, which sends the WhatsApp OTP
Handle the challenge
Cognito returns a challenge to the client, prompting for the OTP. Your UI should now display an input field for the user to enter the code they received
Respond to the challenge
After the user submits the OTP, your application calls the RespondToAuthChallenge API action, sending the user's input. This invokes the "Verify" Lambda trigger, which validates the code and, upon success, issues authentication tokens
Key Benefits for Your Cognito Authentication
Supercharge your AWS Cognito user experience with the power and reliability of WhatsApp for OTP.
Robust & Secure Cognito MFA
Leverage WhatsApp's end-to-end encryption for OTP delivery, adding an extra layer of trust and security to your AWS Cognito multi-factor authentication setup.
Global Reach & Deliverability
Ensure consistent OTP delivery worldwide, overcoming regional SMS challenges. Essential for global applications built on AWS.
Fully AWS-Native Experience
Our open-source Custom Sender seamlessly extends Cognito, letting you manage your authentication entirely within the AWS ecosystem.
Start Enhancing Cognito for Free
Begin building with our open-source Cognito integration today. No credit card required, ample messages to get you started.
600 Free WhatsApp Messages/Month
Test, integrate, and deploy your Cognito OTP solution without commitment. Our generous free tier ensures you can build and iterate with ease.
Full Source Code for Cognito Integration
Gain full transparency and control with our dedicated AWS Cognito WhatsApp OTP integration repository. Fork it, customize it, and deploy it with confidence.
Beyond Cognito: Explore More API Integrations
SendZen's flexible API powers WhatsApp messaging for a wide array of platforms and languages. Find your perfect fit.
Programming Language / Framework
Our comprehensive REST API and SDKs make integration straightforward for Java, C#, PHP, Ruby, Go, and more.
Need a Different Integration?
We're constantly expanding our integration ecosystem. Don't see your preferred auth platform? Let us help you build a custom solution.
Book a Demo - Let's Build It TogetherFrequently Asked Questions about Cognito & WhatsApp OTP
Find answers to common questions about implementing WhatsApp OTP with AWS Cognito and SendZen.
Ready to upgrade your Cognito Authentication?
Explore our open-source solution, sign up for SendZen's free tier, and start delivering secure WhatsApp OTPs today.