I got the same error after ssl has been renewed.. please help
[20-Sep-2017 00:38:04 UTC] id was called incorrectly. Product properties should not be accessed directly. Backtrace: require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), do_action(‘template_redirect’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WC_AJAX::do_wc_ajax, do_action(‘wc_ajax_checkout’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WC_AJAX::checkout, WC_Checkout->process_checkout, WC_Checkout->process_order_payment, WC_Payment_Gateways->get_available_payment_gateways, apply_filters(‘woocommerce_available_payment_gateways’), WP_Hook->apply_filters, call_user_func_array, WC_Subscriptions_Payment_Gateways::get_available_payment_gateways, WC_Subscriptions_Cart::cart_contains_subscription, WC_Subscriptions_Product::is_subscription, WC_Abstract_Legacy_Product->__get, wc_doing_it_wrong. This message was added in version 3.0.
