Until now I used development push certificate and the push notifications worked great.
Now I want to submit my app to Apple so I created a production certificate a
You can test APNS production environment building an AdHoc version of your App. The app will be using the production certificates and servers and it's purpose is exactly to test BEFORE you send it to AppleStore.
Take a looke at this link: what kind of certificate do I need to test apns using ad-hoc distribution?