Below is a list of actions and filters that plugin developers can use to extend the functionality of the plugin and yet be able to upgrade the plugin without losing those changes. You can count on these actions and hooks to continue to exist in future versions of the plugin.

Subscription Form Creation/Editing Interface

Actions

_wpr_subscriptionform_created_handler_save

Run when a subscription form was saved. It is triggered after the subscription form’s settings have been changed. Currently found in forms.php

_wpr_subscriptionform_form_field

Run when the subscription form interface is being rendered. This is the hook to latch on to if you want to add more fields to the subscription form interface. The hook is run after the subscription form submit button text.