Class: Events are our way of letting you know when something interesting happens in your account. When an interesting event occurs, we create a new Event object. For example, when a charge succeeds, we create a charge.succeeded event; and when an invoice payment attempt fails, we create an invoice.payment_failed event. Note that many API requests may cause multiple events to be created. For example, if you create a new subscription for a customer, you will receive both a customer.subscription.created event and a charge.succeeded event.