Izharsyah, J.R., Saleh, A., Adhani, A. and Mahardika, A. 2023. Implementation and Challenges : "Digital Payment System Port Transportation in Developed Countries in Southeast Asia’’. KnE Social Sciences. 8, 5 (Mar. 2023), 66–80. DOI:https://doi.org/10.18502/kss.v8i5.12989.