Production-ready ML system that authenticates payments through voice biometrics. Features: → ECAPA-TDNN speaker model for voice embedding and matching → Adaptive ML that learns genuine vs impostor behavior per user over time → Two-layer verification: voice match + optional Whisper passphrase challenge → AES-GCM encrypted voice templates for security → FastAPI REST API enroll, verify, plug into any app Tech: Python · PyTorch · SpeechBrain · OpenAI Whisper · FastAPI · librosa