Use AWS Lambda to send pushover notifications. The event JSON looks like this:
{
"token": "your app token from pushover",
"key": "your user key from pushover",
"message": "your message to send"
}
On OSX clone the repo then npm i --save
and zip up the contents of the folder.
Upload that to lambda and create a test event with the JSON.
POW! You're done.
Hard code your token and key into the code and you can use IAM to control who is able to send push notifications via an API Gateway.