Luna is a publisher and seller of ebooks. You can tell that.
This store / website / platform is associated with the poetry website
Paintbucket.page in various plain
ways that should also be obvious to you.
This store was built by @BigProsody
with Node.js on a laptop that he bought from
Best Buy maybe four years ago. Email fufillment (that is, sending the ebook
to you after charging your card) is automated using
Mailgun. Everything to do with money is handled by
Stripe, which is a subsidery of Wells Fargo.