1- Log in to developer.apple.com Member Center (the Account link on the home page)
2- Go to “Certificates”
3- Select “App ID” from left panel
4- Click on “+” on top right
5- Add App ID with Push Notifications option checked
6- Click on created App ID and select Edit
7- Click Configure in Push Notifications panel
8- Open Keychain Access app in your Mac
9- From Keychain Access menu, click Certificate Assistant -> Request a Certificate from a Certificate Authority
10- Enter your mail in the first text field
11- Enter your name in the second text field