Digital transformation is essential to financial sustainable development. Since the beginning of 2020, the whole world has been under the influence of the COVID-19 pandemic, which has accelerated the pace of financial digitization. According to the perceived usefulness of the technology acceptance model (TAM) and the perceived seriousness of the health belief model (HBM), this study developed and explored the theoretical framework of consumers’ continuance usage intention toward e-payment. A questionnaire survey was conducted to explore this continuance usage intention among consumers who have used e-payment in Taiwan during the COVID-19 pandemic, with a total of 387 valid samples. The overall model was analyzed by structural equation modeling (SEM). The empirical results showed that the security, perceived seriousness, and perceived usefulness of e-payment significantly affect electronic word of mouth (eWOM), while the security and perceived seriousness of e-payment have a significant effect on continuance usage intention through perceived usefulness and eWOM. During the COVID-19 pandemic, e-payment providers should encourage consumers to use e-payment via eWOM, perceived usefulness, and consumers’ perceived health seriousness and should improve the use efficiency of e-payment through e-payment financial services, thus encouraging consumers’ continuance usage intention toward e-payment.

This paper explores how to construct a fair and optimal compensation system between the principal and the agent in the face of financial compensation agency problems during a limited period in relation to the concept of sustainability. In the construction of the principal’s compensation system, the agent’s degree of operational financial effort will affect the overall revenue function for reaching sustainability. Both the principal and the agent have a maximum expected utility in the negative exponential pattern of the general hyperbolic absolute risk aversion (HARA) utility function that satisfies their respective objective functions. The proposed model and numerical example analysis results prove that the compensation system for sustainability can provide a fair and optimal financial system, from a sustainability perspective. The main contribution of this study is the construction and development of an optimal compensation agency model for risk management, which is derived by considering the effect of risk aversion utility on revenue. The proposed model can provide a fair and feasible approach within the issue of compensation, from the viewpoint of sustainability, for an optimal compensation agency problem.