Dorthea Elvita Harefa; Fikrah Kristo Fotriman Waruwu; Dian Maharani Buulolo; Christine Jenny Puspita Zega; Ester Ratna Cahyani Zega; Devi Chrisman Lase. Certificate Printing System Integrated With RESTful API JSON on Quistiq Application. justindo. j. sist. dan. teknol. inf. id. 2026, 11, 28-37.