You can either connect WebCoRE with IFTTT and use IFTTT to send to pushover or send a web request directly. Here is an example of using a web request, start by clicking Add a new piston then Restore a piston using a backup code with the code btyn
to copy the piston shown below. Fill in your token and user id, save the piston then use the Test button to try it out:
This looks like a useful service, do you know if it allows you to choose different notification sounds on iOS? That would be very useful for my notification piston, always looking for something that sounds different than the default used by every other app…
Edit: fixed content type which needed to be FORM not JSON