41 C.F.R. § 102-118.65 Can my agency receive electronic billing for payment of transportation services?
Title 41 - Public Contracts and Property Management
Yes, when mutually agreeable to the agency and the GSA Audit Division, your agency is encouraged to use electronic billing for the procurement and billing of transportation services.
Title 41: Public Contracts and Property Management
PART 102–118—TRANSPORTATION PAYMENT AND AUDIT
Subpart B—Ordering and Paying for Transportation and Transportation Services
§ 102-118.65 Can my agency receive electronic billing for payment of transportation services?

