Hide checkbox (with code) for other Nations - php

Question

I need help with this code that i found on a blog:
// Display the custom checkbow field in checkout
add_action( 'woocommerce_review_order_before_order_total', 'fee_installment_checkbox_field', 20 );
function fee_installment_checkbox_field(){
echo '<tr class="packing-select"><th>';
woocommerce_form_field( 'installment_fee', array(
'type' => 'checkbox',
'class' => array('installment-fee form-row-wide'),
'label' => __('Consegna su appuntamento'),
'placeholder' => __(''),
), WC()->session->get('installment_fee') ? '1' : '' );
echo '</th><td>';
}
// jQuery - Ajax script
add_action( 'wp_footer', 'checkout_fee_script' );
function checkout_fee_script() {
// Only on Checkout
if( is_checkout() && ! is_wc_endpoint_url() ) :
if( WC()->session->__isset('installment_fee') )
WC()->session->__unset('installment_fee')
?>
<script type="text/javascript">
jQuery( function($){
if (typeof wc_checkout_params === 'undefined')
return false;
$('form.checkout').on('change', 'input[name=installment_fee]', function(){
var fee = $(this).prop('checked') === true ? '1' : '';
$.ajax({
type: 'POST',
url: wc_checkout_params.ajax_url,
data: {
'action': 'installment_fee',
'installment_fee': fee,
},
success: function (result) {
$('body').trigger('update_checkout');
},
});
});
});
</script>
<?php
endif;
}
// Get Ajax request and saving to WC session
add_action( 'wp_ajax_installment_fee', 'get_installment_fee' );
add_action( 'wp_ajax_nopriv_installment_fee', 'get_installment_fee' );
function get_installment_fee() {
if ( isset($_POST['installment_fee']) ) {
WC()->session->set('installment_fee', ($_POST['installment_fee'] ? true : false) );
}
die();
}
// Add a custom calculated fee conditionally
add_action( 'woocommerce_cart_calculate_fees', 'set_installment_fee' );
function set_installment_fee( $cart ){
if ( is_admin() && ! defined('DOING_AJAX') || ! is_checkout() )
return;
if ( did_action('woocommerce_cart_calculate_fees') >= 2 )
return;
if ( 1 == WC()->session->get('installment_fee') ) {
$items_count = WC()->cart->get_cart_contents_count();
$fee_label = sprintf( __( "Consegna su appuntamento" ), '×', $items_count );
$fee_amount = 4;
WC()->cart->add_fee( $fee_label, $fee_amount );
}
}
add_filter( 'woocommerce_form_field' , 'remove_optional_txt_from_installment_checkbox', 10, 4 );
function remove_optional_txt_from_installment_checkbox( $field, $key, $args, $value ) {
// Only on checkout page for Order notes field
if( 'installment_fee' === $key && is_checkout() ) {
$optional = ' <span class="optional">(' . esc_html__( 'optional', 'woocommerce' ) . ')</span>';
$field = str_replace( $optional, '', $field );
}
return $field;
}
I want to hide this checkbox in checkout page if the customer Nation is not Italy. Thank you!
I've added a checkbox in checkout page, and now i expect to hide this checkbox if the customer nation is not Italy (so this checkbox will be only visible for Italian customers