AyeCode / invoicing

        return apply_filters( 'wpinv_cart_details', $this->cart_details, $this->ID, $this );

    }

    public function get_subtotal( $currency = false ) {

        $subtotal = wpinv_format_amount( $this->subtotal, NULL, !$currency );

        if ( $currency ) {

            $subtotal = wpinv_price( $subtotal, $this->get_currency() );

        }

        return apply_filters( 'wpinv_get_invoice_subtotal', $subtotal, $this->ID, $this, $currency );

    }

    public function get_total( $currency = false ) {        

        if ( $this->is_free_trial() ) {

        return $data;

    }

    public function get_final_tax( $currency = false ) {        

        $final_total = wpinv_format_amount( $this->tax, NULL, !$currency );

        if ( $currency ) {

            $final_total = wpinv_price( $final_total, $this->get_currency() );

        }

        return apply_filters( 'wpinv_get_invoice_final_total', $final_total, $this, $currency );

    }

    public function get_discounts( $array = false ) {

        $discounts = $this->discounts;

        return $this->discount_code;

    }

    public function get_tax( $currency = false ) {

        $tax = wpinv_format_amount( $this->tax, NULL, !$currency );

        if ( $currency ) {

            $tax = wpinv_price( $tax, $this->get_currency() );

        }

        return apply_filters( 'wpinv_get_invoice_tax', $tax, $this->ID, $this, $currency );

    }

    public function get_fees( $type = 'all' ) {

        $fees    = array();