Explore everything about OTP Service in India with this complete guide on what OTP is and how OTP works. Learn how one-time passwords enable secure login, OTP verification, mobile verification, and two-factor authentication for apps and websites. This article explains OTP delivery, OTP SMS service, OTP API, and OTP gateway integration used by banks, fintech, e-commerce, and online pla... https://crm.smsgatewayhub.com/knowledge-base/article/otp-service-in-india-what-is-otp-and-how-does-it-work-complete-guide-2025