The following are the broad strokes on how to create an APNs Certificate.
Log into Apple Developer Centre
Press the “Certificates, IDs & Profiles” link in the navigation.
Certificate, IDs and Profiles
First press the “APNs Auth Key” and then press the “+” button to the right hand side of the “iOS Certificates (APNs Auth Key)” title.
Select Certificate Type
Now select the “Apple Push Notification service SSL (Sandbox & Production)” option and then press the “Continue” button at the bottom of the page.
Select App ID
Select the ID of the app that will be receiving the push notifications.
Create a CSR
This is an information scene detailing the steps that must be undertaken to create a CSR.
Open the Keychain
Open the “Keychain Access” app.
Generate the CSR
Select the “Request a Certificate From a Certificate Authority” menu item.
Certificate Information
Enter the details relevant to the app, and be sure to select the “Saved to disk” option.
CSR Created
The certificate request has now been created.
Press the “Show In Finder…” button.
Upload CSR
Now go back to your browser and click “Continue”. The “Upload CSR file” form is displayed. Press “Choose File…” and select the CSR as found in the previous step.
Certificate Ready
The certificate is now ready.
Press the “Download” button and the aps.cer file is downloaded to your Downloads directory.
Certificate in the Keychain
Double click the .cer file to load it into the keychain.
