1. Khan BUI, Olanrewaju RF, Baba AM, Langoo AA, Assad S (2017) A compendious study of online payment systems: past developments, present impact, and future considerations. Int J Advan Comput Sci Appl 8(8):256–271
2. Kedar MS (2015) Digital India new way of innovating India digitally. Int Res J Multi Stud 1(4):34–49
3. Lahiri A (2020) The great Indian demonetization. J Econ Perspect 34(1):55–74
4. Kou Y, Lu CT, Sirwongwattana S, Huang YP (2004) “Survey of fraud detection techniques.” In: IEEE international conference on networking, sensing and control, 2004
5. Gopal RK, Meher SK (2007) A rule-based approach for anomaly detection in subscriber usage pattern. Int J Math, Phys Eng Sci 1(3):396–399