While in the portal (login.xeroxreceipts.com), there is a Reimbursement Account drop-down. This drop-down will be populated with any “Other Current Liabilities” accounts you have specified in QuickBooks Online.

This is a Short Term Liability account, which is used to transact an expense reimbursement. More information on this workflow can be found at the following URL under the heading “Record the expense for future payments” – https://quickbooks.intuit.com/community/Employees-and-payroll-taxes/How-to-reimburse-an-employee/td-p/186139