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I am working on the same thing. How are you taking orders for hosting? Are you using a script, or just taking the contact info? Also, who are you using for domain registrations? They might have a script that you can integrate with your site. I am planning on using whois.cart for both hosting and domain registration. While I don't think I can make whois.cart an actual XOOPS module, I do hope to wrap it so that it feels integrated from a user perspective.
John