My wordpress site allows registered users opt-in to email alerts for replies to their comments. This is provided by the plugin "Send email only on Reply to My Comment" ([url removed, login to view]). I want you to create a copy of this plugin and add the option "Send Push Notification ONLY If Someone Replies To My Comment(s)." You will also see I have a plugin called "OneSignal Push Notifications". This allows notifications to be sent to the user's browser / mobile device. One Signal has an API ([url removed, login to view]). I would like you to code the "Send Push Notification ONLY If Someone Replies To My Comment(s)." option so that if a user has selected the option then (1) if they have not opted into notifications then they have the option to opt-in, then (2) when a comment is made in reply to their comment, then the notification is sent.