41 C.F.R. § 301-75.4 – Payment methods for pre-employment interviewee travel expenses.

Table 1 to § 301-75.4
For	Agency will
Common carrier transportation expenses other than transit systems at the agency's location	Bill the expenses to a centrally billed or other agency established account. Agencies may provide the traveler with a GTR only if no other option is available or feasible. Interviewees may not receive travel advances or use individual Government contractor-issued charge cards.
Other expenses	Require payment by the interviewee and reimburse the interviewee for allowable travel expenses upon submission and approval of the interviewee's travel claim.