invoiceninja/app/controllers/ClientApiController.php

<?php

use ninja\repositories\ClientRepository;

class ClientApiController extends Controller
{
    protected $clientRepo;

    public function __construct(ClientRepository $clientRepo)
    {
        $this->clientRepo = $clientRepo;
    }

    public function ping()
    {
        $headers = Utils::getApiHeaders();

        return Response::make('', 200, $headers);
    }

    public function index()
    {
        $clients = Client::scope()->with('contacts')->orderBy('created_at', 'desc')->get();
        $clients = Utils::remapPublicIds($clients->toArray());

        $response = json_encode($clients, JSON_PRETTY_PRINT);
        $headers = Utils::getApiHeaders(count($clients));

        return Response::make($response, 200, $headers);
    }

    public function store()
    {
        $data = Input::all();
        $error = $this->clientRepo->getErrors($data);

        if ($error) {
            $headers = Utils::getApiHeaders();

            return Response::make($error, 500, $headers);
        } else {
            $client = $this->clientRepo->save(false, $data, false);
            $client->load('contacts');
            $client = Utils::remapPublicIds($client->toArray());
            $response = json_encode($client, JSON_PRETTY_PRINT);
            $headers = Utils::getApiHeaders();

            return Response::make($response, 200, $headers);
        }
    }
}