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To be sure that every OCPI message is not modified without our permission during its transit, the Open Charging Network requires that every OCPI message is signed by its sender*. This is achieved by implementing the OCN - Signature in your OCPI 2.2 interface. Any node of the Open Charging Network production environment requires application of the OCN - Signature, otherwise your OCPI messages will not get transmitted.
*In fact, OCN - Node Operators can optionally disable the requirement for signed messages. However, we strongly advise not to run OCN - Nodes on the Production Environment without message signing enabled.
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Currently the Notary library is available as an NPM package and as a Maven package for languages targeting the JVM. Head on over to the OCN - Notary repository to find more information for each package.
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