WooCommerce: Save minimum amount within the order data when a free shipping method is selected

<?php
/**
 * WooCommerce:
 * Save the free shipping methodminimum amount (if set) within the order data when a free shipping method is selected
 */
add_action( 'woocommerce_checkout_create_order', 'wpo_safe_free_shipping_amount_within_order_data' );
function wpo_safe_free_shipping_amount_within_order_data( $order ) {
    $chosen_shipping_methods = WC()->session->get( 'chosen_shipping_methods' );

    // If a free shipping method is selected...
    if ( strpos( $chosen_shipping_methods[0], 'free_shipping' ) !== false ) {
        list( $shipping_name, $shipping_id ) = explode( ':', $chosen_shipping_methods[0] );

        // ...get the minimum amount from its settings
        $free_shipping_settings = get_option( "woocommerce_{$shipping_name}_{$shipping_id}_settings" );
        $min_amount = $free_shipping_settings['min_amount'];

        // If there is a minimum amount set, save it within the order data
        if ( ! empty( $min_amount ) ) {
            $order->update_meta_data( '_free_shipping_min_amount', $min_amount );
            $order->save();
        }
    }
}