This case study outlines the challenges and solutions related to electronic invoicing (eInvoicing) integration for B2B buyers. It identifies integration complexity as a significant barrier during the onboarding process, leading to buyer frustration. The study highlights that a notable percentage of B2B buyers find the inability to integrate easily into their existing systems a serious pain point. Manual processing of invoices is discussed as a contributing factor to inefficiencies, with financial decision-makers reportedly losing substantial work time resolving payment operations issues. The case study presents TreviPay's eInvoicing integration as a solution that streamlines the invoicing process by enabling seamless incorporation into existing business systems. It details the integration process, which includes initiation, development, testing, and launch phases. The results indicate that successful integrations lead to fewer manual errors and increased efficiency, ultimately improving the buyer payment experience. TreviPay's support throughout the integration process is emphasized as a critical component for success.