yf_payment_handler class

    public function balance_refresh($options = null)
    {
        $_user_id = null;
        // import options
        is_array($options) && extract($options, EXTR_PREFIX_ALL | EXTR_REFS, '');
        if (($_user_id ?? null) < 1) {
            return  null;
        }
        $user_id = (int) $_user_id;
        $api = _class('api');
        $payment = module('payment');
        $payment_api = _class('payment_api');
        // get account by user_id
        list($account_id, $account) = $payment_api->get_account(['user_id' => $user_id]);
        if (empty($account_id)) {
            return  null;
        }
        list($currency_id, $currency) = $payment_api->get_currency__by_id($account);
        $payment->t($currency, 'currency');
        $result = [
            'account' => $account,
            'currency' => $currency,
        ];
        return  $result;
    }