AyeCode / invoicing

        $this->recalculate_total();

    }

    private function decrease_subtotal( $amount = 0.00 ) {

        $amount          = (float) $amount;

        $this->subtotal -= $amount;

        $this->subtotal  = wpinv_round_amount( $this->subtotal );

        if ( $this->subtotal < 0 ) {

            $this->subtotal = 0;

        }

        $this->recalculate_total();

    }

    private function increase_fees( $amount = 0.00 ) {

        $amount            = (float)$amount;

        $this->recalculate_total();

    }

    private function decrease_fees( $amount = 0.00 ) {

        $amount            = (float) $amount;

        $this->fees_total -= $amount;

        $this->fees_total  = wpinv_round_amount( $this->fees_total );

        if ( $this->fees_total < 0 ) {

            $this->fees_total = 0;

        }

        $this->recalculate_total();

    }

    public function recalculate_total() {

        global $wpi_nosave;