Thanks for your contribution Jason.
I tried this out by creating a free account at pushover.net, installing and configuring this (app key as well as user key for my user) without issues on 2.5.

However after i enabled messages to be sent via pushover i faced a :
"{"device":"invalid","errors":["device is invalid or user has no enabled devices"],"status":0,"request":"34534.....eaf26"} - perhaps i'm supposed to configure more things? or install other applications and devices. (pushover has my email but i didn't receive notifications via email which seems to suggest device notifications only?)

This may be a good time to perhaps link to some documentation to help get users started on this.
While we're on urls,
consider adding, via 'Edit this plugin' :
- documentation url
- code repository url
- issue tracker url

Hopefully we can get this shared soon and well!

Also, '$DB->insert_record('message_processors', $provider);' shouldn't be needed within your plugin's install.php . Moodle should automatically do this during plugin installation

Jason - Many thanks for sharing this plugin with the Moodle community. I noticed a validation warning:

Maturity information ($plugin->maturity) not found in version.php

Also, I noticed the copyright indicates All Rights Reserved which I believe in contrary to GPL. Would you mind removing the All Rights Reserved statement from all of the files?

I also like to encourage folks to follow the Moodle recommended Github repository naming convention for their plugins which is moodle-{plugintype}_{pluginname}. Would you mind renaming the repository to moodle-message_pushover.

Thanks for your attention to these details. For the moment, I am going to mark this plugin as needing more work; however, once you get things tidied up we can schedule it for another look and hopefully get it promptly approved.

Peace - Anthony

Thanks Jason - looks great. I'm approving it now. Peace - Anthony

Jason - Might I ask you take a look at:

http://docs.moodle.org/dev/Messaging_2.0#Message_types_.28providers.29

and

http://docs.moodle.org/dev/Messaging_2.0#Message_outputs_.28processors.29

There is a distinction made between Message types (providers) and Message outputs (processors). You mentioned that this is a message type provider in the description; however, I suspect it is really a message output processor. When you can, would you mind checking to see if that might be updated to avoid confusion? Peace - Anthony

have been using Pushover for more than a year to receive critical alerts for work. I go on call once every three weeks and this app has never let me down. The feature that I like the most from the paid service is that I can create an application with its own email address and set up my alerts to go to that email address. Any of my devices running pushover can then receive that alert. The service itself is far more configurable than that but for the sake of brevity I will keep it short. Also one of my other favorite things is the API. We are going to be doing some very interesting things with alerts that require acknowledgment. My biggest request is that Superblock LLC would add a third type of alert (level 3?) that has an approve/deny response instead of a simple repeat alert until acknowledged. I would like to be able to push approve/deny workflow items to my phone and be able to capture those responses on the backend or with a postback like I can with level 2. It would also be great if the repeat frequency of the level 2 and 3 alerts could be configured. Now you can get all apps and games for free using TopStore app store. Get it from https://topstorevip.com/