A valid receipt will show specifics about the purchase – what was purchased, when, where, the amount, and proof of payment. Generally, the person making the purchase possesses the receipt, which substantiates who should be reimbursed. For airfare, hotel and car rental, a detailed receipt is required, (duplicate receipts can usually be obtained from the merchant) though a credit card statement may be requested as evidence of who paid for the expense. A receipt is also needed for conference registration fees and when any single expense is more than $75. If a detailed receipt is not available for these types of expenses, but the traveler’s credit card statement documents the purchase, the traveler should provide a copy of the credit card statement as proof of payment along with a written explanation in lieu of a receipt citing what was purchased, when, where, and why a receipt cannot be provided.