Implementation of Google Play Billing (GPB) for Indonesian Developers and Consumers based on Law No. 5 of 1999 Concerning Monopoly Practices. ldj [Internet]. 2024 Dec. 24 [cited 2026 Oct. 22];6(4):576-87. Available from: https://jurnal.unissula.ac.id/index.php/ldj/article/view/42098