Flat rate - QTY auto checked

fuction.php

add_filter( 'wcv_product_shipping_fee_national_qty', 'change_default_product_shipping_fee_national_qty' );
	function change_default_product_shipping_fee_national_qty() {

$field['id'] = '_shipping_fee_national_qty';
$field['label'] = __( 'Charge once per product for national shipping, even if more than one is purchased.', 'wcvendors-pro' );
$field['type'] = 'checkbox';
$field['value'] = 'yes';
$field['class'] = 'wcv-disable-national-input'; // This checks the checkbox
return $field;

	}

	

	add_filter( 'wcv_product_shipping_fee_international_qty', 'change_default_product_shipping_fee_international_qty' );
	function change_default_product_shipping_fee_international_qty() {

$field['id'] = '_shipping_fee_national_qty';
$field['label'] = __( 'Charge once per product for national shipping, even if more than one is purchased.', 'wcvendors-pro' );
$field['type'] = 'checkbox';
$field['value'] = 'yes';
$field['class'] = 'wcv-disable-national-input'; // This checks the checkbox
return $field;

	}