Technically, because we are selling NumXL through FastSpring, our payment processor, FastSpring will be the vendor of record in this transaction.

• FastSpring’s W9 info is here:
  http://www.fastspring.com/w9.pdf
• FastSpring’s contact info can be found here (see “I'm a buyer”):
  https://www.fastspring.com/contact-us

Please let us know if you have any additional questions.