The fourth edition of BrowserStack's device features blog series focuses on testing security workflows via device passcode and biometric authentication on real devices for Android and iOS platforms. These features are available on both App Live and App Automate, allowing developers to validate payment transactions, enable app login, access specific in-app content, and test other advanced use-cases. The blog provides a step-by-step guide on enabling biometric authentication and testing with device passcode. It also explores real-world use cases such as Login Authentication, Payment Transactions, Secondary Login, and Specific In-App Content Access. BrowserStack aims to help customers build and deliver high-quality software by making mobile testing more robust and comprehensive.