## 2 Literature Review  
This research was grounded on the Diffusion of Innovation Theory (DOI), particularly the Technology Acceptance Model (TAM). [PERSON] pioneered DOI in 1962, and it is one of the oldest social science theories. The DOI and TAM theory has extensively demonstrated how individuals have adopted and implemented e-ordering and e-invoicing/e-informing by abandoning manual processes [64]. This model has helped companies truly understand how buyers integrate and interact with potential technologies over time, and it also explains how an idea may go through multiple phases of adoption by multiple players [65]. Adopting a behavior becomes difficult since certain programs in society do not allow them [66]. This theory, on the other hand, demonstrates how innovation as a system aims to promote economic and social development [67]. It appears to evaluate an innovation based on five qualities. These are the qualities of innovation, complexity, relative advantage, compatibility, trialability, and observability [59; 60]. The Technology Acceptance Model (TAM) theory ([PERSON], (1989)) is an outgrowth of [PERSON] (1989) Theory of Reasoned Action (TRA). The perceived ease of use (PEOU) and perceived usefulness (PU) have a major impact on the user's perspective, which can be favorable or unfavorable towards the system, based on the user's perspective [68]. TAM superseded TRA with two standardized technical characteristics, PU and PEOU, which were regarded to be beneficial and thought to have an impact on the individual desire to employ modern technology [69]. PU and PEOU have a significant impact on users' attitudes regarding system utilization. TAM has distinguished itself by investigating and evaluating the problems influencing the user acceptance of new technologies. This has helped companies enhance their performance by promoting usage and acceptance, as well as providing individual differences, social inspirations, beliefs, attitudes, and situational impacts [70]. Moreover, the TAM predicts the motivation to execute a variety of abilities by assuring that organizations function smoothly and efficiently. The key components of the TAM, which can accurately evaluate the individual's attitude and intent regarding EPT acceptance and actual use in procurement processes, are PEOU and PU [61]. This theory shows that the recognition and usage of technology depend on the users' feelings and perceived advantages of the system. The individual's positive or negative attitude determines the actual behavior of the individual regarding their technological use. Additionally, [PERSON]. [71] found that the implementation of EPTs has a beneficial influence on the perception of employees, both in the field of sustainable purchasing and supply chain performance. Moreover, [PERSON]. [72] concluded that EPTs have a significant contribution to the procurement process and smoothen the supply-chain performance. EPTs are implemented by being able to develop and provide solutions that are crucial for the protection of environmental habitats, while at the same time restricting energy consumption or other assets and helping to combat global warming [1; 22; 73]. According to Ref. [74], companies may leverage ICT-enabled resources to create the competencies needed to embrace green technologies, combine them with interfirm technological innovations, and design and deploy procedures to do so. In other words, companies may leverage ICT capital to create inimitable skills. EPTs integrate the use and buying of ICT to process purchase orders, share information with suppliers, and encourage purchasing choices. The literature analysis has shown that, in the background of green procurement, as well as the supply chain performance, EPTs systems have hardly been studied. Because the EPTs ask for digital technology to be used and do not use paper or printers extensively, it falls within the green procurement category [22; 43]. In Malaysia, using the digital procurement technique enhances the performance of the supply chain [47]. According to Ref.