TY JOUR TI DIGITAL TRANSFORMATION OF TRAVEL EXPENSE MANAGEMENT IN THE BANKING SECTOR: IMPLEMENTATION EXPERIENCE AND ECONOMIC EFFECT ASSESSMENT KW business process digitalization KW travel expense management KW advance report KW accounting automation KW API integration KW banking sector KW TDABC KW operational efficiency JO Russian Journal of Management AU Andreeva, A.A. AU Troitskaya, N.N. PY 2026 IS 14 PB Publishing Center RIOR