This study investigates the aspects of e-payment security concerning e-commerce consumers’ purchase intentions. This study further involves college students in Semarang – Indonesia as representatives of the millennial generation. Structural equation modeling (SEM) using Wrap-PLS is employed to analyze the data. The findings show a fit model to explain e-commerce customers’ purchase intentions. The results of this study reveal a better mediating effect of perceived usefulness on e-payment security and customers’ purchase intentions. Perceived ease of use also has a significant indirect effect, through e-payment security, on e-commerce customers’ purchase intentions. In addition, understanding the ease and usability of the security aspects of the payment affects e-commerce consumers' purchase intentions. The results also give a heightened awareness of security in electronic transactions.