Pass the optional and required parameters as per the official API docs. See the DTO reference below for more information. 
package com.example.myapp;

import com.unkey.unkeysdk.dto.KeyCreateResponse;
import com.unkey.unkeysdk.dto.KeyCreateRequest;

@RestController
public class APIController {

    private static IKeyService keyService = new KeyService();

    @PostMapping("/createKey")
    public KeyCreateResponse createKey(
            @RequestBody KeyCreateRequest keyCreateRequest,
            @RequestHeader("Authorization") String authToken) {
        // Delegate the creation of the key to the KeyService from the SDK
        return keyService.createKey(keyCreateRequest, authToken);
    }
}

​
DTOs Reference

The DTOs used in the code for a better understanding of request and response bodies.

​
Request

public class KeyCreateRequest {
    @NonNull
    private String apiId;
    private String prefix;
    private String name;
    private Integer byteLength;
    private String ownerId;
    private Meta meta;
    private Integer expires;
    private Integer remaining;
    private KeyRateLimit ratelimit;
}

public class Meta {
    private Map<String, String> meta;
}

public class KeyRateLimit {
    private String type;
    private Integer limit;
    private Integer refillRate;
    private Integer refillInterval;
}

​
Response

public class KeyCreateResponse {
    @NonNull
    private String key;
    @NonNull
    private String keyId;
}