Abstract: A computer-implemented method and system manages and processes outstanding invoices within various accounting software applications. The method includes analyzing a web page to identify a unique invoice identifier (e.g., within the web page's URL or a user interface element of the web page), obtaining additional invoice information from the accounting system based on the unique invoice identifier, and displaying this information in a user-friendly interface. A web browser plugin facilitates real-time data synchronization and payment processing by interacting with the accounting system through an API. The system streamlines the payment process by reducing the number of steps required, improving the efficiency and accuracy of financial transactions. The system is designed to be compatible with multiple accounting systems and web browsers, ensuring broad applicability and ease of use.