Question about the KMIP client API

I am trying to implement a KMIP client, that can help our application integrating with Vault through KMIP, but I don’t have the API detail. Could anybody help me get the API definition so that I can get the related KMIP API done in client side?

I know this is an older message, but in case anyone else is looking, the protocol description is found here : Key Management Interoperability Protocol Specification Version 2.1