We recently witnessed some issues occurring when customers using WooCommerce and Subscriptions deleted their payment methods (when they have a credit card “on file”). When they also have active subscriptions using the card they just deleted, most customers don’t realize that they also have to update their card for each of the active subscriptions.
We’ve added a more robust way of dealing with this to the Subscriptions roadmap, but in order to stem the bleeding from the immediate issue, I whipped together a mini-plugin that will pop up an alert whenever a customer deletes a payment method.
The plugin can be downloaded for free here: https://github.com/Prospress/woocommerce-subscriptions-delete-payment-method-confirmation