Part G. Authority to Participate in Multistate Efforts to Develop Sales and Use Taxes. § 1–301.121. Definitions. § 1–301.122. Authority to participate in multistate negotiations. § 1–301.123. Authority to enter into agreement. § 1–301.124. Relationship to District of Columbia law. § 1–301.125. Agreement requirements. § 1–301.126. Cooperating sovereigns. § 1–301.127. Limited binding and beneficial effect. § 1–301.128. Seller and third party liability.