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Transactions sent to the Service Layer for SAP Business One use a web service call that uses a JSON data structure. The structures must be specifically as the Service Layer expects the (order of values) and certain values are expected depending on the transaction. In addition, some values must be sent as enumerators. These are specific values that represent other values in the SAP Business One database. A list of the most common enumerators is found here.
Samples of the JSON structures for key SAP Business One objects can be found in the links below.