This paper explores leading methods for integrating e-invoicing solutions across global supply chains. Page 1 introduces compliance pressures driven by tax authorities, real-time reporting mandates, and interoperability requirements. The paper compares four integration models: direct ERP connectors, middleware/B2B gateways, API-based networks, and fully managed services. It explains trade-offs in scalability, implementation speed, regulatory alignment, and cost. Visual diagrams illustrate data flows and validation checkpoints. The document offers guidance for selecting an approach based on maturity, transaction volume, regional regulations, and internal IT capabilities.

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