Introduction

Want to add secure, passwordless login to your WordPress or WooCommerce site using MSG91 OTPs? The Happy Coders OTP Login plugin makes this incredibly simple. This step-by-step guide will walk you through configuring MSG91 for OTP login, WhatsApp delivery, and WooCommerce transactional SMS using this powerful plugin.

Step 1: Install Happy Coders OTP Login Plugin

1. Go to WordPress Admin → Plugins → Add New

2. Search for “Happy Coders OTP Login”

3. Click Install Now, then Activate

Plugin URL: https://wordpress.org/plugins/happy-coders-otp-login/

Step 2: Create and Configure Your MSG91 Account

1. Sign up or log in to https://msg91.com

2. In the MSG91 Dashboard, go to API

3. Copy your Auth Key

4. Under Sender ID, apply for a 6-character transactional sender (like HPCDRE)

5. Go to Flow Builder and create a Transactional Flow

   • Use variables like {{otp}} and {{name}}

   • Make sure your content complies with India’s DLT regulations

6. Copy the Flow ID for use in the plugin

Step 3: Configure Plugin Settings in WordPress

1. Go to WordPress Admin → Settings → MSG91 OTP & SMS

2. Fill in the following:

   • Auth Key (from MSG91)

   • Sender ID (e.g., HPCDRE)

   • Flow ID (must be a DLT-approved template)

3. Optional:

   • Enable WhatsApp OTP fallback

   • Choose which countries are allowed via the country code dropdown

4. Click Save Changes

Step 4: Add OTP Form to Your Site

You can display the OTP login form anywhere using:

Or trigger the modal/popup login with a button or link like:

The plugin automatically replaces the WooCommerce My Account login/registration form too.

Step 5: Enable WooCommerce SMS Alerts (Optional)

The plugin supports MSG91-powered transactional messages for key WooCommerce events:

• New User Registration

• Order Placed

• Order Shipped (with tracking)

• Order Delivered

• Abandoned Cart Recovery

You can configure these under the plugin’s SMS tab and choose Flow IDs for each.

Step 6: Test and Monitor Delivery

1. Register or log in with a test mobile number

2. Ensure OTP is received instantly

3. Check SMS logs inside MSG91 > Reports

4. For any delivery failures:

   • Ensure the message matches the DLT template exactly

   • Confirm the mobile number is correct and DND-free

   • Check if your DLT registration is complete (India only)

Conclusion

Using the Happy Coders OTP Login plugin with MSG91 gives you enterprise-grade OTP login and customer SMS updates in minutes. Whether you’re a blogger, store owner, or developer, this integration brings better security, faster logins, and improved conversions to your WordPress site.