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Shopify WhatsApp OTP Login Case Study | Custom UI Extension Solution

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written by: Renuka M
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Problem Statement

 

Earlier, Shopify legacy customer accounts were based on the traditional email and password login system. While this method was widely used, it often created friction for users due to forgotten passwords, repeated login failures, and a less convenient experience.

 

To address this, Shopify introduced a new customer account system that replaced passwords with email based OTP (One Time Password) authentication, making login simpler and more secure.

 

However, our client wanted to go beyond this improvement. Since their target audience actively uses WhatsApp for communication, they aimed to create a login experience that not only simplifies access but also helps them collect and utilize customer WhatsApp contact details for future engagement and marketing.

 

Challenges

 

Implementing this requirement came with multiple technical and experience related challenges:

  • Shopify provides limited flexibility when it comes to customizing the customer login flow, especially with the new account system
  • Replacing the default email OTP system with WhatsApp OTP required a custom built solution
  • Ensuring secure OTP generation, delivery, and validation outside Shopify’s native authentication system
  • Maintaining a seamless and fast user experience without adding complexity to the login process Integrating third party WhatsApp APIs reliably for real time OTP delivery
  • Making sure the solution works consistently across mobile and desktop devices

Process

 

To achieve the desired outcome, we followed a structured and strategic approach:

  • First, we analyzed Shopify’s legacy and new customer account login systems to understand their limitations and possibilities
  • We identified the opportunity to enhance the login flow by introducing WhatsApp as the primary authentication channel
  • Designed a custom login interface that aligns with the brand while keeping the experience simple and intuitive
  • Leveraged Shopify UI extensions to override and enhance the default login experience
  • Integrated a secure WhatsApp API to generate and send OTPs instantly to users
  • Built a backend mechanism to validate OTPs securely and ensure safe authentication
  • Conducted multiple rounds of testing to ensure speed, reliability, and usability across different devices and network conditions

Solution

 

We implemented a fully customized login system using Shopify UI extensions that enables WhatsApp based OTP authentication. Instead of relying only on email OTP, customers can now enter their mobile number and receive a one time password directly on WhatsApp.

 

This approach simplifies the login process and aligns with user behavior, as most customers actively use WhatsApp daily. The solution ensures secure authentication while providing a smooth and modern user experience. It also allows the client to capture verified customer contact details during login.

 

Benefits

 

This solution delivered significant improvements for both the business and its customers:

  • Faster Login Experience: Users can log in instantly without remembering passwords
  • Higher Login Success Rate: Reduced friction leads to fewer drop offs
  • Improved User Experience: Familiar platform (WhatsApp) makes the process easier
  • Better Customer Data Collection: Verified mobile numbers can be used for future communication
  • Enhanced Engagement: Enables direct marketing and updates through
  • WhatsApp Strong Security: OTP based authentication ensures safe and reliable access
  • Mobile First Optimization: Ideal for users who primarily shop on mobile devices

Conclusion

 

By extending Shopify’s default authentication system and introducing WhatsApp OTP login through a custom UI extension, we transformed the customer login experience into a faster, more user friendly, and highly engaging process.

 

This solution not only improved usability and security but also helped the client build a stronger connection with their customers through WhatsApp, ultimately supporting better retention, communication, and business growth.