DAVID NWANNA DUMBIRI; LULUK MAKHMIA; PUTRI WULAN MANDASARI; YOGA DWI FIRMANSYAH; FIRZA AGUNG PRAKOS. Analysis of Contract Law in the Indonesian Legal System: A Case Study of Default in Online Purchase Transactions. Jurnal Sahabat ISNU SU , [S. l.], v. 3, n. 1, p. 01–05, 2026. DOI: 10.70826/jsisnu.v3i1.1244. Disponível em: https://journal.isnu-sumut.org/index.php/jsisnu/article/view/1244. Acesso em: 26 jun. 2026.