Transformer Based Framework for Imbalanced Transaction Fraud Detection in FinTech Systems - Shivam, Sandeep; Nutalapati, Venkat; Patel, Tejas Pravinbhai; Padhy, Amit Kumar; Kumari, Madhushree; Purushothaman, Rajesh (2026 14th International Symposium on Digital Forensics and Security (ISDFS), Digital Forensics and Security (ISDFS), 2026 14th International Symposium on, 2026)