Hello Tuan,
In this case "Recurring subscriptions by Paypal", it is possible to include for next updates a "Unsubscribe" button that is shown in the front, where it takes the user to an article with instructions to cancel the subscription in Paypal?
Could you link this button with an article in the since the configuration of the subscription plan as the policies already available?
Thank you very much
Regards,
Bernabé