PayPal Secure Technology | Data Protection | PayPal US
TOTP Authenticator
Configuring the Time-Based One-Time Password (TOTP) Tool for Two-Factor Authentication Using Google Authenticator - NetIQ® CloudAccess and MobileAccess Installation and Configuration Guide
How To Secure PayPal Account with TOTP Authenticator | by Nitin Sharma | BinaryBoot Blog | Medium
How to enable two-factor authentication (TOTP) : The Best Rated EmaiI Signature Portal