W. Va. Code § 11-15A-1
(b) Definitions. —
(1) "Affiliated person" means a person that, with respect to another person:
(8) "Marketplace facilitator" means a person that contracts with one or more sellers to facilitate for consideration, regardless of whether deducted as fees from the transaction, the sale of the seller’s products through a physical or electronic marketplace operated by the person, and engages:
(A) Directly, or indirectly, through one or more affiliated persons, in any of the following:
(B) In any of the following activities with respect to the seller’s products:
(18)
(B) "Referrer" does not include a person that:
(24) "Retailer engaging in business in this state" or any like term, unless otherwise limited by federal statute, means and includes, but is not limited to:
(B) On and after January 1, 2014, any retailer that is related to, or part of a unitary business with, a person, entity or business that, without regard to whether the retailer is admitted to do business in this state pursuant to §31D-15-1 et seq. of this code or §31E-14-1 et seq. of this code, is a subsidiary of the retailer, or is related to, or unitary with, the retailer as a related entity, a related member or part of a unitary business, all as defined in §11-24-3a of this code;
(32) "Use" means and includes:
(B) The use or enjoyment in this state of the result of a taxable service. As used in this subdivision, "enjoyment" includes a purchaser’s right to direct the disposition of the property or the use of the taxable service, whether or not the purchaser has possession of the property.
The term "use" does not include the keeping, retaining or exercising any right or power over tangible personal property, custom software or the result of a taxable service for the purpose of subsequently transporting it outside the state for use thereafter solely outside this state.
(33)
(B) "Virtual currency" shall not be construed to include any of the following: