The answer to this question depends on the agreement with the consultant and what was included in the statement of work (SOW) submitted to PSC as to how travel costs were agreed to be paid, as a reimbursed cost or part of the consultant rates.
Consultants who are hired as independent contractors must follow PSC guidance on how travel costs are paid to independent consultants. Travel costs should be included in the SOW form and covered using the same procurement method as the service payment. See: Hire an Independent Contractor: “Costs to Include.”