Dioputra MR, Siregar H. The Role of Gamification Mechanisms in CRM Systems in Enhancing Customer Loyalty: A Systematic Literature Review. JISS [Internet]. 2026 Mar. 14 [cited 2026 Mar. 14];7(3):759-71. Available from: https://jiss.publikasiindonesia.id/index.php/jiss/article/view/2254