“…Another discovery obtained from this research is the existence of a barcode scan where this barcode scan is used to provide complaints if there is an unsatisfactory service (Aziz, Jabar, Abdullah, & Nor, 2022;Rachmawati, Farda, Rijanta, & Setiyono, 2019;Zahid, Rahman, Ullah, & Muhammad, 2021). Complaints in the form of barcode scans were not investigated by previous researchers (Mangani, Syaukat, Arifin, & Tambunan, 2019;Rizliyanto et al, 2017;Setiyono, Shihab, & Azzahro, 2019;Zaffar, Kumar, & Zhao, 2019).…”