APIURL is the well-known HTTP GET endpoint that retrieves description of the plugin's interfaces.

FunctionsURL exposes the templates functions that are available via this plugin.

ImplementsRequest is the rpc wrapper for the Implements method args.

ImplementsResponse is the rpc wrapper for the Implements return value.

InputExample is the interface implemented by the rpc implementations for group, instance, and flavor to set example input using custom/ vendored data types.

Handshake is a simple RPC object for doing handshake.