— Guides
OTP and verification guides for India
How to build an OTP flow that is secure and easy to complete, and how to find the cause when codes don't arrive.
All OTP and verification guides
— OTP and verificationOTP not delivered? A troubleshooting checklist for Indian SMS routes
Where SMS OTPs fail in India (template scrubbing, wrong header categories, handset quirks) and how to instrument the flow before your users notice.
· 9 min read
— OTP and verificationWhatsApp OTP vs SMS OTP: choosing a verification channel in India
SMS reaches every handset; WhatsApp authentication templates add one-tap codes and a different cost model. How the two compare, and when to sequence both.
· 8 min read
— OTP and verificationSMS OTP best practices: expiry, rate limits, and auto-read
How to build a secure, low-friction SMS OTP flow in India: code length, expiry, attempt caps, voice fallback and Android auto-read, without storing codes.
· 8 min read