DAVID NWANNA DUMBIRI; LULUK MAKHMIA; PUTRI WULAN MANDASARI; YOGA DWI FIRMANSYAH; FIRZA AGUNG PRAKOS. Contract Law and Default in Indonesian E-Commerce Transactions: Legal Certainty, Consumer Protection, and the Future of Digital Contract Enforcement. Jurnal Sahabat ISNU SU , [S. l.], v. 3, n. 1, p. 118–129, 2026. DOI: 10.70826/jsisnu.v3i1.1244. Disponível em: https://journal.isnu-sumut.org/index.php/jsisnu/article/view/1244. Acesso em: 13 aug. 2026.