get Token Accurate

public function gettoken()
    {
        $dataMeta      = $this->db->get_where('app_meta', array('meta_id' => 1))->row();
        $clientId      = $dataMeta->meta_client_id;
        $clientSecret  = $dataMeta->meta_client_secret;
        $oauthCallback = $dataMeta->meta_auth_callback;

        // Code setelah Callback, bisakh otomatis
        $code       = trim($this->input->get('code'));
        $baseEncode = $clientId . ':' . $clientSecret;
        $basicAuth  = base64_encode($baseEncode);
        $header     = array(
            "Authorization: Basic " . $basicAuth,
        );

        $content = array(
            "code"         => $code,
            "grant_type"   => "authorization_code",
            "redirect_uri" => $oauthCallback,
        );
        $url  = "https://account.accurate.id/oauth/token";
        $opts = array("http" => array(
            "method"        => "POST",
            "header"        => $header,
            "content"       => http_build_query($content),
            "ignore_errors" => true,
        ),
        );

        $context       = stream_context_create($opts);
        $response      = file_get_contents($url, false, $context);
        $json          = json_decode($response);
        $access_token  = trim($json->access_token);
        $refresh_token = trim($json->refresh_token);

        return $access_token;
    }