Under the background of global cross-border mobile commerce integration, the importance of cross-border payment research is becoming increasingly prominent and urgent. The important value of this study is to empirically research the influence power of key elements in using two different mobile payment platforms in Korea. The extended unified theory of acceptance and use of technology has been widely applied in various studies because of its strong interpretive power. In Korea, there are a few empirical studies on Chinese users. Based (...) on a survey of 908 Chinese participants in Korea, this study is one application extending UTAUT2 by incorporating multi-group and multi-model constructs: UTAUT2, information system success model, and an initial trust model, considering a multi-group analysis with some mediating variables. By comparing the two different payment platforms’ characters, this manuscript provides a set of targeted measures to ensure Chinese WeChat Payment platform decision-makers create effective long-term strategic policies for cross-border m-payments in Korea, and eventually, benefit cross-border m-commerce and economic cooperation in Southeast Asia. (shrink)