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Generate APNS certificate for iOS Push Notifications
Apple Push Notification Service (commonly referred to as Apple Notification Service or APNS) is a platform service created by Apple Inc. that enables third party application developers to send push notifications to iOS users. You must have Paid Apple Developer account to create certificates. Below are the steps to create .p12 certificate require to send push notification.
Create an App ID
Login to Apple developer account and click Certificates, Identifiers and Profiles
Select iOS from dropdown
Select App IDs from side menu and create a new App ID
Specify App name, Bundle ID and select Push Notifications, then Continue
Click Register, then Done to complete app registration
Now, you can see the app listed in App IDs
Generate a Certificate from Keychain Access
Launch the Keychain Access application in your Mac OS X and Select Keychain Access -> Certificate Assistant -> Request a Certificate From a Certificate Authority
Enter email address and check the ‘Saved to disk’ option, then click Continue
Generate a Development Certificate
Go back to developer account and select app from App IDs and click Edit
Scroll Down to Development SSL certificates and click Create Certificate
Choose certificate file created from Keychain Access in previous section and click Continue
Download Development Certificate and click Done to finish process
Generate APNS .p12 certificate
Double click APNS certificate generated in previous step to add it to Keychain Access. Go to Keychain Access, select login keychain and My Certificate from side menu. Find app certificate and right click to export it
Enter certificate name and click Save
Enter password for certificate and click OK
Done. This development .p12 certificate can be used to send push notification. See below references for server code to send push notification to iOS device.