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

The KMIP specification describes primarily the over-the-wire protocol – not the client-side API. A given vendor’s KMIP client API is likely to differ from any other vendor’s client API. The value of enforcing KMIP compliance is that a KMIP client from Vendor-X can interoperate with a KMIP server from Vendor-Y.