Notification Emailer app is here to give notifications updates to your users as you want.
You can give notification as per your wish. Like on change of subscription,invoice status. Notification can also be send on Pre Expiration , Post Expiration , Post activation of subscription and when payment get completed etc.
This is already installed with Payplans, you are not required to install any other plugin.
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Documentation Link : http://www.readybytes.net/payplans/documentation/item/notification-emailer.html