Developed and implemented a comprehensive E-Invoicing solution for SAP Business One that ensures full compliance with tax authority regulations while streamlining the invoicing process. This mission-critical solution handles the entire e-invoicing lifecycle, from document generation to digital signing and submission to tax authorities. The solution implements advanced integration with SAP B1 using both DI API and Service Layer, featuring real-time document processing, digital signature integration, and automated submission to tax authority portals. Key features include automated validation against tax authority schemas, digital signature application, and real-time submission status tracking. The implementation includes sophisticated error handling and retry mechanisms, comprehensive logging for audit purposes, and a user-friendly dashboard for monitoring submission status and managing exceptions. The system maintains high performance while ensuring 100% compliance with regulatory requirements.