HACK #1 - Adding a custom field to shipping class

Check the plugin code for usage.

Don't get overwhelmed! Most of the file in this repo is related to unit testing or integrated build.

Following files are all need to get this running :

woo-add-shipping-class/
├── class-custom-woo-shipping-class-fields.php   (your intrested code)
└── init.php                                     (plugin main file)

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Steps -

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STEP 1 - Display Field Name in Header

//loc: woocommerce/includes/admin/settings/class-wc-settings-shipping.php #adding coulmns to list header
apply_filter('woocommerce_shipping_classes_columns', $shipping_columns_array) ;

STEP 2 - Display Fields

//loc: woocommerce/includes/admin/settings/views/html-admin-page-shipping-classes.php
do_action('woocommerce_shipping_classes_column_'.$class)

STEP 3 - Update the database with the values set

//loc: woocommerce/includes/class-wc-ajax.php #function to add/update shipping class metas value
do_action('woocommerce_shipping_classes_save_class', $term_id, $data);

STEP 4 - Modify shipping class object to add these fields' data before localization

//loc: woocommerce/includes/class-wc-shipping.php #function to modified localized shipping class data
apply_filter('woocommerce_get_shipping_classes', $shipping_classes);