41 C.F.R. § 102-118.50 How does my agency pay for transportation services?
Title 41 - Public Contracts and Property Management
Your agency may pay for transportation services in three ways: (a) Electronic funds transfer (EFT) (31 U.S.C. 3332, et seq.). Your agency is required by statute to make all payments by EFT unless your agency receives a waiver from the Department of the Treasury. (b) Check. For those situations where EFT is not possible and the Department of the Treasury has issued a waiver, your agency may make payments by check. (c) Cash. In very unusual circumstances and as a last option, your agency payments may be made in cash in accordance with Department of the Treasury regulations (31 CFR part 208).
Title 41: Public Contracts and Property Management
PART 102–118—TRANSPORTATION PAYMENT AND AUDIT
Subpart B—Ordering and Paying for Transportation and Transportation Services
§ 102-118.50 How does my agency pay for transportation services?

