E-invoicing is considered a revolutionary step in the world of business. It enables companies to improve the efficiency of financial transactions and provide their clients with a seamless experience. In conjunction with the development of this system in KSA, Phase Two of e-invoicing is rolled out to complete the efforts being made to standardize and simplify the invoicing system. This phase aims to provide financial transactions with a higher level of security and transparency. In this article, we will discuss the importance of Phase Two e-invoicing in detail and how REST ERP is considered the best solution for this phase.