E-payment paradigm in the context of fighting corruption and increasing transparency at the public-sector authority’s level is becoming more important than ever especially for Eastern Europe. The present research will address how an electronic payment system is affecting the diffusion of innovation among online public services, settling the challenges at the government level, providing solutions for diminishing the money laundering in the country and all other associated problems. Diffusion of innovations theory had been investigated by many scholars in different industries and countries. The research implication is to generate general knowledge by fulfilling the literature gap related to electronic payment systems in the public sector and diffusion of innovations. The research aim is to provide (1) an extensive literature review to gain familiarity principally on the diffusion of innovation theory, secondary on government electronic payment systems and cashless societies; (2) collect, explore and analyze empirical evidence related to the perceived attributes of diffusion of innovations theory and the rate of adoption of e-payment system designed for public services from the perspective of consumers, public service providers, and payment operators; (3) answer the research questions by the aid of the diffusion of innovation theory, and measure the rates of adoption of public e-payment systems by using an case study approach, the researchers analyzed the case of Moldova and the Governmental Payment Gateway MPay, one of the initiatives launched by the Public Institution e-Government Center.  The interpretivism research paradigm was adopted for the research, and an exploratory case study methodology is implemented to gain insights, familiarity with the subject, and acquire more knowledge in the concepts and theoretical frameworks that are related to the research problem and question.