Send Custom Header using Xendit PHP Library

CustomXenditHttpClient.php

<?php
class CustomXenditHttpClient implements \Xendit\HttpClientInterface
{
    public function request($method, $uri, array $options = []) {
        $client = new \GuzzleHttp\Client([
            'headers' => ['X-API-VERSION' => '2019-02-04'],
            'base_uri' => \Xendit\Xendit::$apiBase,
        ]);

        return $client->request($method, $uri, $options);
    }
}

web.php

<?php
Route::post('/ovo', function () {
    $params = [
        'external_id' => '12345678',
        'amount' => 80001,
        'phone' => '081234567890',
        'ewallet_type' => 'OVO',
    ];

    \Xendit\Xendit::setHttpClient(new CustomXenditHttpClient);

    $ovo = \Xendit\Ewallets::create($params);
    dd($ovo);
});