While doing some research on making LN Address available on the domains of customers of lightningcheckout (npub1lhu…t08x) I came to the conclusion it's quite easy to do so in general. If you run a Wordpress site you can do it easily with a WoS address for example.
1. Install a redirect plugin, for example wordpress.org/plugins/simple…
2. Setup a redirect as on the image below.
You can receive now sats on lightning address: pay@<your domain>.com which redirect directly to the #walletofsatoshi lightning address of lightningcheckout (npub1lhu…t08x) (lncheckout)
If you have your own domain and you can fix the redirect in another way, you can do it without wordpress as well.