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.GetAPIResponse;

@RestController
public class APIController {

    private static IAPIService apiService = new APIService();

    @GetMapping("/get-api")
    public GetAPIResponse getAPI(
            @RequestParam String apiId,
            @RequestHeader("Authorization") String authToken) {
        // Delegate the creation of the key to the IAPIService from the SDK
        return apiService.getAPI(apiId, authToken);
    }
}

​
DTOs Reference

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

​
Response

public class GetAPIResponse {
    private String id;
    private String name;
    private String workspaceId;
}