Complete Technical Guide with MFA, Firebase, and Biometric Setup
By [Third Rock Techkno](<https://www.thirdrocktechkno.com/>)
Fintech apps deal with sensitive financial data, making authentication the first line of defense. A weak login system can lead to data breaches, financial fraud, and compliance violations (GDPR, PCI DSS, PSD2).
According to IBM’s Cost of Data Breach Report, the average cost of a financial data breach exceeds $5.9M per incident.
For FlutterFlow fintech apps, this means MFA, strong encryption, and biometric login aren’t optional they’re mandatory.
FlutterFlow (powered by Firebase) supports:
Email/Password Authentication
Phone OTP Authentication
Social Logins (Google, Apple)
Biometric Authentication (Face ID, Fingerprint) via custom actions
Multi-Factor Authentication (MFA) using Firebase + custom flows