TY JOUR TI Credit risk in the BNPL era: behavioural scoring and portfolio profitability KW BNPL KW behavioral scoring KW credit risk KW PD KW LGD KW EAD KW limit dosing KW antifraud KW reject-correction KW contribution margin KW vintage analysis JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Lykov, N.S. PY 2025 IS 0 PB ITBO University