41 CFR § 301-70.705
What methods of payment for official travel expenses may we authorize when an exemption from use of the Government contractor-issued travel charge card is granted?
June 9, 2020
When you grant an exemption from use of the Government contractor-issued travel charge card, you may authorize one or a combination of the following methods of payment:
(a) Personal funds, including cash or personal charge card;
(b) Travel advances; or
(c) Government Transportation Request (GTR).
Note to §301-70.705: City pair contractors are not required to accept payment by the methods in paragraph (a) or (b) of this section.