Remember: Prod & Dev enviorments have different Notification IDs & Endpoints.
You'll need to post correctly the path (api.clover.com/notifications/ etc) with the correct app ID & notification id as well.
If the notification is too difficult, I would recommend Pushy.me (it's only 0.05 cents per active device & the notifications are guaranteed to be delivered (unless ofcourse the client remains offline) unlike the Clover's notifications which aren't guaranteed to be delievered.
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