Utilization of QRIS as a Marketing Differentiation Strategy to Increase Sales at Warung Sembako Rifqy, Jagakarsa, South Jakarta. interstellar [Internet]. 2025 Oct. 25 [cited 2026 Feb. 7];1(1):46-9. Available from: https://pub.ruangrosadi.com/jurnal-ilmiah/index.php/interstellar/article/view/121