Saving Custom Field Data in WooCommerce

Saving Custom Field Data in WooCommerce — a practical guide to save WooCommerce custom fields with clear examples you can reuse in real projects.

WooCommerce Plugin Development Series (21/101). Prefer one article? Read the complete WooCommerce plugin development tutorial.

Short description

Save product fields on `woocommerce_process_product_meta`, checkout fields on order create hooks, and registration fields on customer create.

Save product meta

add_action('woocommerce_process_product_meta', function ($post_id) {
    $subtitle = isset($_POST['_acme_subtitle'])
        ? sanitize_text_field(wp_unslash($_POST['_acme_subtitle']))
        : '';
    update_post_meta($post_id, '_acme_subtitle', $subtitle);
});