Reimbursements are a type of payout. Reimbursement payouts are the result of an approved expense report. In Reimbi a requester will submit an expense report. The expense report is then reviewed. If approved, a reimbursement for the amount of the expense report is sent to the requester.
Reimbi also handles direct payouts. With direct payouts there is no expense report. Reimbi's customer enters the amount of the payout along with the payees contact information. The payee is notified of the pending payout. After the payout chooses how funds should be received, Reimbi issues the payout amount to the payee.
In summary, reimbursements involve an expense report which is entered by the requester. Direct payouts do not involve an expense report and the amount of the payout is entered directly by the payer.