Add electronic billing fields (Italian customers)

Adds fields for electronic invoicing on the checkout page for Italian customers.

PHP
/**
 * Snippet Name:     Add electronic billing fields (Italian customers)
 * Snippet Author:   coding-bunny.com
 * Description:      Adds fields for electronic invoicing on the checkout page for Italian customers.
 */

add_filter('woocommerce_checkout_fields', 'dmmfe_checkout_fields');
function dmmfe_checkout_fields($fields) {
    unset($fields['order']['order_comments']);
    
    $email_priority = isset($fields['billing']['billing_email']['priority']) ? $fields['billing']['billing_email']['priority'] : 110;
    
    $fields['billing']['billing_need_e_invoice'] = array(
        'label' => __('Ho bisogno della fattura elettronica', 'dmmfe'),
        'type' => 'checkbox',
        'class' => array('form-row-wide'),
        'clear' => true,
        'priority' => $email_priority + 1,
    );
    $fields['billing']['billing_company_name'] = array(
        'label' => __('Ragione Sociale', 'dmmfe'),
        'required' => false,
        'class' => array('form-row-wide', 'dmmfe-hidden-field'),
        'clear' => true,
        'priority' => $email_priority + 2,
    );
    $fields['billing']['billing_vat_code'] = array(
        'label' => __('Partita IVA', 'dmmfe'),
        'required' => false,
        'class' => array('form-row-first', 'dmmfe-hidden-field'),
        'clear' => false,
        'priority' => $email_priority + 3,
    );
    $fields['billing']['billing_tax_code'] = array(
        'label' => __('Codice Fiscale', 'dmmfe'),
        'required' => false,
        'class' => array('form-row-last', 'dmmfe-hidden-field'),
        'clear' => true,
        'priority' => $email_priority + 4,
    );
    $fields['billing']['billing_pec'] = array(
        'label' => __('Indirizzo PEC', 'dmmfe'),
        'type' => 'email',
        'required' => false,
        'class' => array('form-row-first', 'dmmfe-hidden-field'),
        'clear' => false,
        'priority' => $email_priority + 5,
    );
    $fields['billing']['billing_sdi_code'] = array(
        'label' => __('Codice Univoco SDI', 'dmmfe'),
        'required' => false,
        'class' => array('form-row-last', 'dmmfe-hidden-field'),
        'clear' => true,
        'priority' => $email_priority + 6,
    );
    return $fields;
}

add_action('wp_enqueue_scripts', 'dmmfe_enqueue_scripts');
function dmmfe_enqueue_scripts() {
    if (is_checkout()) {
        wp_add_inline_script('jquery', "
            jQuery(document).ready(function($){
                function dmmfe_toggle_fields() {
                    if ($('#billing_need_e_invoice').is(':checked')) {
                        $('.dmmfe-hidden-field').show();
                    } else {
                        $('.dmmfe-hidden-field').hide();
                    }
                }
                
                dmmfe_toggle_fields();
                
                $('#billing_need_e_invoice').on('change', function(){
                    dmmfe_toggle_fields();
                });
                
                $(document.body).on('updated_checkout', function(){
                    dmmfe_toggle_fields();
                });
            });
        ");
    }
}

add_action('woocommerce_checkout_update_order_meta', 'dmmfe_save_order_meta');
function dmmfe_save_order_meta($order_id) {
    if (isset($_POST['billing_need_e_invoice'])) {
        update_post_meta($order_id, '_billing_need_e_invoice', wc_clean(wp_unslash($_POST['billing_need_e_invoice'])));
    }
    if (isset($_POST['billing_company_name'])) {
        update_post_meta($order_id, '_billing_company_name', wc_clean(wp_unslash($_POST['billing_company_name'])));
    }
    if (isset($_POST['billing_vat_code'])) {
        update_post_meta($order_id, '_billing_vat_code', wc_clean(wp_unslash($_POST['billing_vat_code'])));
    }
    if (isset($_POST['billing_tax_code'])) {
        update_post_meta($order_id, '_billing_tax_code', wc_clean(wp_unslash($_POST['billing_tax_code'])));
    }
    if (isset($_POST['billing_pec'])) {
        update_post_meta($order_id, '_billing_pec', sanitize_email(wp_unslash($_POST['billing_pec'])));
    }
    if (isset($_POST['billing_sdi_code'])) {
        update_post_meta($order_id, '_billing_sdi_code', wc_clean(wp_unslash($_POST['billing_sdi_code'])));
    }
}

add_action('woocommerce_admin_order_data_after_billing_address', 'dmmfe_admin_order_display');
function dmmfe_admin_order_display($order) {
    $need_e_invoice = get_post_meta($order->get_id(), '_billing_need_e_invoice', true);
    $company_name = get_post_meta($order->get_id(), '_billing_company_name', true);
    $vat_code = get_post_meta($order->get_id(), '_billing_vat_code', true);
    $tax_code = get_post_meta($order->get_id(), '_billing_tax_code', true);
    $pec = get_post_meta($order->get_id(), '_billing_pec', true);
    $sdi_code = get_post_meta($order->get_id(), '_billing_sdi_code', true);
    
    if ($need_e_invoice == '1') {
        echo '<h3>' . esc_html__('Dettagli Fattura Elettronica', 'dmmfe') . '</h3>';
        echo '<p><strong>' . esc_html__('Fattura Elettronica:', 'dmmfe') . '</strong> ' . esc_html__('Sì', 'dmmfe') . '</p>';
        
        if ($company_name) {
            echo '<p><strong>' . esc_html__('Ragione Sociale:', 'dmmfe') . '</strong> ' . esc_html($company_name) . '</p>';
        }
        if ($vat_code) {
            echo '<p><strong>' . esc_html__('Partita IVA:', 'dmmfe') . '</strong> ' . esc_html($vat_code) . '</p>';
        }
        if ($tax_code) {
            echo '<p><strong>' . esc_html__('Codice Fiscale:', 'dmmfe') . '</strong> ' . esc_html($tax_code) . '</p>';
        }
        if ($pec) {
            echo '<p><strong>' . esc_html__('Indirizzo PEC:', 'dmmfe') . '</strong> ' . esc_html($pec) . '</p>';
        }
        if ($sdi_code) {
            echo '<p><strong>' . esc_html__('Codice Univoco SDI:', 'dmmfe') . '</strong> ' . esc_html($sdi_code) . '</p>';
        }
    }
}

add_filter('woocommerce_email_order_meta_fields', 'dmmfe_email_order_meta_fields', 10, 3);
function dmmfe_email_order_meta_fields($fields, $sent_to_admin, $order) {
    $need_e_invoice = get_post_meta($order->get_id(), '_billing_need_e_invoice', true);
    
    if ($need_e_invoice == '1') {
        $fields['billing_need_e_invoice'] = array(
            'label' => __('Fattura Elettronica', 'dmmfe'),
            'value' => __('Sì', 'dmmfe'),
        );
        
        $company_name = get_post_meta($order->get_id(), '_billing_company_name', true);
        if ($company_name) {
            $fields['billing_company_name'] = array(
                'label' => __('Ragione Sociale', 'dmmfe'),
                'value' => $company_name,
            );
        }
        
        $vat_code = get_post_meta($order->get_id(), '_billing_vat_code', true);
        if ($vat_code) {
            $fields['billing_vat_code'] = array(
                'label' => __('Partita IVA', 'dmmfe'),
                'value' => $vat_code,
            );
        }
        
        $tax_code = get_post_meta($order->get_id(), '_billing_tax_code', true);
        if ($tax_code) {
            $fields['billing_tax_code'] = array(
                'label' => __('Codice Fiscale', 'dmmfe'),
                'value' => $tax_code,
            );
        }
        
        $pec = get_post_meta($order->get_id(), '_billing_pec', true);
        if ($pec) {
            $fields['billing_pec'] = array(
                'label' => __('Indirizzo PEC', 'dmmfe'),
                'value' => $pec,
            );
        }
        
        $sdi_code = get_post_meta($order->get_id(), '_billing_sdi_code', true);
        if ($sdi_code) {
            $fields['billing_sdi_code'] = array(
                'label' => __('Codice Univoco SDI', 'dmmfe'),
                'value' => $sdi_code,
            );
        }
    }
    
    return $fields;
}

add_action('wp_head', 'dmmfe_custom_styles');
function dmmfe_custom_styles() {
    if (is_checkout()) {
        echo '<style>
            .optional { display:none !important; }
            .dmmfe-hidden-field { display:none; }
            .woocommerce-additional-fields { display:none !important; }
        </style>';
    }
}

How To Implement This Solution?

Read our guide or watch the video tutorial.

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