Apple pay certificates: 

https://help.apple.com/developer-account/#/dev04fd06d56

Apple pay identifiers:

https://help.apple.com/developer-account/#/dev1b35d6f83

Apple Pay certificate creation:

Below is the link to create certificate for apple and there is a step by step process.

https://help.apple.com/developer-account/#/dev04fd06d56

After going this link:

• Create certificate
• Create identifier
• Create device
• Create provisional profile and the devices in provisional profile.

Apple Pay Plugin Guide:

I am using this code to create the apple pay plugin. Below link is for GitHub directory.

https://github.com/samkelleher/cordova-plugin-applepay

Below method we are using for apple pay:

Payment flow full example and response is given in the above link.

https://github.com/samkelleher/cordova-plugin-applepay

Enable apple pay in Apple store for your app:

https://help.apple.com/developer-account/#/devb2e62b839?sub=dev103e030bb

Apple Pay allows users to purchase goods and services within your app. To add the Apple Pay to your App ID,

First create a merchant identifier,

Then enable Apple Pay

And create a payment processing certificate.

Sand Box testing for apple pay:

For testing apple pay in development mode, you need to do below settings:

https://developer.apple.com/apple-pay/sandbox-testing/

You can get the test cards on apple site.