is defined as the ability of a seller or a buyer together acting as trading parties to exchange compliant e-invoices and other supply chain electronic messages containing the essential information elements required by both seller and buyer, irrespective of the information technology environment, back-office systems, or third-party solutions or services used by each. Although interoperability is usually based on a cooperation model between service provider/access points offering access to an interoperable network, it is also essential to consider the requirements and facilities required to fully support the needs of end-users i.e. the trading parties in the chain, as this is the underlying interoperability that needs to be supported.

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