If you are enabling Apple Pay on the Web, you need to register and verify your domain with Apple to allow payment processing.
- Log in to your Apple Developer account at https://developer.apple.com.
- Click Certificates, Identifiers & Profiles.
The page loads and presents a menu.
- Click Merchant IDs.
- Select your merchant identifier and click Edit.
- In the Merchant Domains section, click Add Domain.
- Fill in your domain name and verify this.