app\models\Payment::markVoided PHP Method

    public function markVoided()
    {
        if ($this->isVoided() || $this->isPartiallyRefunded() || $this->isRefunded()) {
            return false;
        }
        $this->refunded = $this->amount;
        $this->payment_status_id = PAYMENT_STATUS_VOIDED;
        $this->save();
        Event::fire(new PaymentWasVoided($this));
        return true;
    }