The company that owns and operates Leanpub is Ruboss Technology Corporation. It is a British Columbia, Canada company. Its business number is: 845146190.
Our VAT identification number is: EU372002581. We have the EU prefix since we are a Canadian company which has registered to collect and remit VAT under the VAT OSS system.
Hopefully the above information should be sufficient.
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Interested in creating your first Leanpub book? Here are some quick tutorials for our most popular writing modes: http://help.leanpub.com/en/articles/3088382-quick-walkthroughs-for-getting-started-on-a-leanpub-book