Verify domain for Apple Pay with Stripe

Adds Stripe's domain association file for Apple Pay verification to your WordPress site and makes it available at https://<YOUR_SITE_DOMAIN>/.well-known/apple-developer-merchantid-domain-association.

Troubleshooting

• Apple Pay requires SSL. This means you must have an SSL certificate installed on your website and your domain must be accessible at an URL that starts with https.
• You must have custom permalinks enabled (anything but Plain) from Settings => Permalinks in your WordPress dashboard. If the plugin doesn't work, make sure the URL is not blocked by your web server and that request is being passed to WordPress.