OTP (One-Time Password)

A one-time password (OTP) is a temporary code, typically sent via email or SMS, that is valid for a single authentication session. OTPs expire after a short period and cannot be reused, making them more secure than static passwords. They are commonly used to verify a user's identity before granting access to gated content or sensitive accounts.

OTPs provide a strong verification layer without requiring readers to create and remember a password. This reduces friction for content access while maintaining security. For publishers distributing confidential or premium content, OTPs ensure that only verified recipients can view the material, and the temporary nature of the code prevents unauthorized sharing.

FlipLink supports access control mechanisms that verify reader identity before granting entry to protected publications. When combined with [lead capture](/features/lead-capture) and [privacy and access control](/features/privacy-and-access-control) features, publishers can gate content behind email verification, ensuring that readers prove their identity before viewing. This approach collects verified contact information while keeping the access experience simple for the reader.

A consulting firm distributes a confidential market analysis flipbook to a select group of clients. Each client enters their email address to receive a one-time verification code. After entering the code, they gain access to the full report. If someone tries to forward the link, the new recipient would need to verify through their own email to view the content.