On This Page 
    Part 3: Perform Additional Setup for Apple Pay on the Web
    If you develop web pages that support Apple Pay on the Web, your customers can use Apple
            Pay to purchase goods and services from within your web page. You can use the same Apple
            Pay merchant ID and Apple Pay payment processing certificate as required for Apple Pay
            in-app implementations. However, Apple Pay on the Web requires additional set-up tasks
            that you perform in your Apple Developer account:
- Creating an Apple Pay merchant identity certificate
 - Registering your merchant domains with Apple
 
If you created multiple merchant ID and payment processing certificate pairs
            to support multiple environments, such as sandbox and production,
            you must associate each ID-and-certificate pair with a unique merchant identify certificate.