Sweet Baby

You can also find older version of this tutorial on Stack overflow which I answered Here

First of all login into your developers account  –  https://developer.apple.com/account/

you will be redirected to following screen, Click on “Certificates”.

Step 1 : Click “+” button

Step 2 : Select “Apple Push Notification service SSL (Production)” and click “Continue”

Step 3 : Now, Select the app ID drop Drop down list and click on “Continue” to go to the next step.

Step 4: Follow the steps under “About Creating a Certificate Signing Request (CSR)” for Creating Certificate Signing Request

In addition to the instructions provided by Apple, Here are some

additional screenshots to guide you creating required certificate.

Step 4.1 Select “Request a Certificate From a Certificate

Authority” by navigating “Certificate Assistance” from toolbar options

for keychain.

Step 4.2 Fill the required certificate Info. – select  “Saved to disk” and select “Continue”

Step 5: Upload  “.certSigningRequest” file which was generated (in Step 4), then click “Generate”.

Step 6: Now Click “Done” to finish the registration,the page will be refreshed and you will see this screen

Then Click “Download” button to download the certificate (.cer file)

you’ve created just now and then double click the downloaded file

to install the certificate into Keychain Access on your Mac.

Step 7: Now go to “Keychain” on you mac system, look for

the certificate you have just installed. If you are unsure which

certificate is the correct , it should start with “Apple Production IOS

Push Services”and  followed by app’s bundleID.

Step 8: Expand the certificate, you should see the

private key with either your name or your company name. Select both

items by using the “Select” key on your keyboard, right click (or

cmd-click if you use a single button mouse), choose “Export 2 items”,

like Below:

Then save the p12 file with name “pushcert.p12″ to your Desktop – now

you will be prompted to enter a password to protect it, you can either

click Enter to skip the password or enter a password you desire.

Step 9: Now the most difficult part – open “Terminal” on your Mac, and run the following commands

Step 10: Remove pushcert.p12 from Desktop to avoid

mis-uploading it to Build Your Own area. Open “Terminal” on your Mac,

and run the following commands:

Okay then, we are done with this tutorial. we successfully generated

.pem file, If you find any difficulties generating .pem please do

comment and we will be happy to help.