A client emails: "we've got hundreds of failed orders, is the payment gateway broken? " The gateway is almost certainly fine. What is happening is worse, it is documented by WooCommerce itself, and the damage will outlast the attack by months.
Source: [Dev.to](https://dev.to/artem_meleshkin_0c4e0a675/woocommerce-failed-orders-what-a-spike-a-stall-and-a-silence-each-mean-49cg)