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Perceived Security and Trust as Determinants of QRIS Usage Among Informal Traders: Evidence from Car Free Day Merchants in Padangsidimpuan. JETA [Internet]. 2026 Aug. 30 [cited 2026 Oct. 15];2(1):55-6. Available from: https://ejournal.risetanakbangsa.id/jeta/article/view/1440