nOTP is a new authentication method that leverages WhatsApp to offer a seamless login experience, significantly reducing costs associated with traditional SMS-based One-Time Password (OTP) systems. Designed for businesses facing scalability challenges with OTP authentication, nOTP utilizes WhatsApp's infrastructure to authenticate users without requiring them to enter login IDs or codes, thus minimizing user fatigue and security vulnerabilities associated with OTPs. By allowing users to log in through a simple interaction with the WhatsApp app, nOTP addresses issues such as message deliverability during international travel and high variable costs of SMS. The system is implemented using Descope's Flows or SDKs, offering a convenient and native experience for users, especially beneficial for mobile apps and smart device authentication, where it simplifies the process and reduces friction. The name "nOTP" was chosen to highlight its departure from traditional OTP methods, emphasizing its ease of use and cost-effectiveness.