Apple Account

Create an Apple account

In case you don't have an Apple ID, you would need to create an Apple account:

Go to Apple website to Create Your Apple ID
Fill all the details and then select Continue
Verify the email used and the phone number that you have used
After you have successfully verified the details you will be directed to the manage account screen

Create an Apple developer account

To create an Apple account you would need to follow the steps below

Sign in to your Apple account
Go to Apple Developer Account site
Select Apple Developer Program
Select Enroll on the top right of the screen

You will be directed to the next screen which will give details of What You Need To Enroll
After reading What You Need To Enroll instructions and making a decision if you need to enroll as an Individual or an Organization, click on Start Your Enrollment
You can download Apple developer app on the App Store to continue with the sign up on iPhone/iPad or you can Continue enrollment on the web
You will be required to fill out the personal information then select Continue.
Select the entity type for the developer account you wish to create then click Continue.
On the legal agreement between your organization and Apple screen you can read the agreement.
After reading and you agree to be bound by the Apple Developer Program License Agreement, you can tick the checkbox and click Continue
On the Purchase the membership screen, confirm the details of the membership period and the membership amount then click Purchase
After clicking Purchase you will be directed to Complete Your Order Screen where you will fill out your card details and address details and click Continue
You will successfully create a developer account.

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 a Paid Apple Developer account to create certificates. Below are the steps to create .p12 certificate required to send push notifications.

Create an App ID

Log in to your Apple Developer account
Click Certificates, Identifiers and Profiles you will be directed to Certificates, Identifiers and Profiles screen

Select iOS, tvOS, watchOS from the dropdown

Select App IDs from the side menu and create a new App ID by clicking the add icon

Enter the App name, Bundle ID and select Push Notifications, then Continue

After being directed to the next screen click Register, then Done to complete app registration

Now, you can see the app listed in App IDs

Generate a Certificate from Keychain Access

Generating a certificate from Keychain Access requires macOS

Open Spotlight by pressing Command ⌘+Space
Search for Keychain Access and press on the app that pops up
Launch the Keychain Access application in your macOS
After Keychain Access application opens up, on the Menu bar select Keychain Access > Certificate Assistant > Request a Certificate From a Certificate Authority