To resolve the url_invalid - line_items[4][price_data][product_data][images][0] error - Stripe Payment Plugin for WooCommerce (https://wordpress.org/plugins/payment-gateway-stripe-and-woocommerce-integration/)

functions.php

<?php // do not copy this line
add_filter('wt_stripe_alter_checkout_request_params', 'wt_stripe_alter_checkout_request_params', 10, 2);
function wt_stripe_alter_checkout_request_params($request, $order){
	if(isset($request['line_items']) &&  !empty($request['line_items']) ){
		foreach($request['line_items'] as $key => $line_item){
			if(isset($line_item['price_data']['product_data']['images']) && is_array($line_item['price_data']['product_data']['images']) && !empty($line_item['price_data']['product_data']['images'])){
				$url = sanitize_url($line_item['price_data']['product_data']['images'][0][0]);
				$request['line_items'][$key]['price_data']['product_data']['images'][0][0] = $url;
			}
		}
	}
	
	return $request;
}