Hutagalung GA, Sembiring Z, Safitri HR, Aswani A, Khairani AI. Implementation of api chat messenger in the integrated presence system at Nur Azizi Tanjung Morawa private high school . Mandiri [Internet]. 2025 Jan. 30 [cited 2026 May 13];13(3):355-60. Available from: https://ejournal.isha.or.id/index.php/Mandiri/article/view/368