add shipping warranty fees

shipping-warranty-fees.php

<?php

add_action( 'woocommerce_review_order_after_shipping', 'shipping_warranty_cb' );
function shipping_warranty_cb() {
	?><tr class="shipping-fee">
		<th><?php _e( 'Assurance Expédition' ); ?></th>
		<td><?php
		woocommerce_form_field( 'shipping_warranty', array(
			'type'     => 'checkbox',
			'class'    => array('checkbox_field'),
			'id'       => 'shipping_warranty',
			'label'    => __('Souscrire à la garantie livraison' ),
			'required' => false,
		), WC()->session->get('shipping_warranty'));
		?></td>
	</tr><?php
}

add_filter( 'woocommerce_cart_calculate_fees', 'add_shhipping_warranty_fees', 10, 1 );
function add_shhipping_warranty_fees( $cart ) {
	if( WC()->session->get('shipping_warranty') ) {
		$amount = 10; // pour 10 €
		$cart->add_fee( __( 'Assurance expédition' ), $amount );
	}
}

add_action( 'wp_ajax_save_shipping_warranty', 'w_save_shipping_warranty' );
add_action( 'wp_ajax_nopriv_save_shipping_warranty', 'w_save_shipping_warranty' );
function w_save_shipping_warranty() {
	$shipping_warranty = ! empty( $_POST['shipping_warranty'] );
	WC()->session->set('shipping_warranty', $shipping_warranty );
	wp_send_json_success();
}

add_action( 'wp_footer', 'w_shipping_warranty_script' );
function w_shipping_warranty_script() {
	if ( is_checkout()) :
	?>
	<script type="text/javascript">
	jQuery( function($){
		$('form.checkout').on('change', 'input[name="shipping_warranty"]', function(){
			$.ajax({
				type: 'POST',
                		url: wc_checkout_params.ajax_url,
                		data: {
				    'action': 'save_shipping_warranty',
				    'shipping_warranty': $('#shipping_warranty:checked').val(),
				},
				success:function() {
					$(document.body).trigger('update_checkout');
				}
			});
		});
	});
	</script>
	<?php
	endif;
}

add_filter( 'woocommerce_checkout_posted_data', 'w_add_shipping_warranty_data' );
function w_add_shipping_warranty_data( $data ) {
	$data['shipping_warranty'] = empty( $_POST['shipping_warranty'] ) ? 0 : 1;
	return $data;
}

add_action( 'woocommerce_admin_order_data_after_shipping_address', 'add_shipping_warranty_info_on_order' );
function add_shipping_warranty_info_on_order( $order ) {
	vprintf( '<p><strong>%1$s</strong> %2$s</p>', array(
		__( 'Assurance expédition :' ),
		$order->get_meta( '_shipping_warranty' ) ? 'Souscrite' : 'Non souscrite',
	) );
}