A Comdata card is like a debit card. Comdata is a financial processor that offers "trust enabled" payment transactions. You have an account at Comdata the same as you would at a bank. Comchecks issued are like cashier's checks or money orders, in that they are the same as cash. The Comdata card can be used at ATM's as a debit card, can be used at most truck stops (not Flying J) to pay at the pump for fuel. It can also be used at many retail stores for point of sale purchases, same as a debit card.
But Comdata can also impose certain rules for allowable purchases, as determined by your company. Some will only allow fuel and oil to be purchased with the card. This comes in handy for large carriers who want to track and control spending. Many carriers pay the drivers via Comdata, by loading their line haul pay directly onto the card, and then you pay yourself via ATM transaction or by cashing a Comcheck at a truck stop. Drivers who run loads from brokers often have the broker pay them via Comcheck.
So basically, Comdata offers business a way to control cusiness purchases, and it offers a way to pay people to are geographically dispersed, or those who don't have bank accounts, or for emergency funds. The card is loaded in real time (no waiting for a day or two for the transaction to hard-post at your bank before you can gain access to it), and then the funds can be withdrawn just like from a real bank, either by Comcheck or with the debit card.
But Comdata can also impose certain rules for allowable purchases, as determined by your company. Some will only allow fuel and oil to be purchased with the card. This comes in handy for large carriers who want to track and control spending. Many carriers pay the drivers via Comdata, by loading their line haul pay directly onto the card, and then you pay yourself via ATM transaction or by cashing a Comcheck at a truck stop. Drivers who run loads from brokers often have the broker pay them via Comcheck.
So basically, Comdata offers business a way to control cusiness purchases, and it offers a way to pay people to are geographically dispersed, or those who don't have bank accounts, or for emergency funds. The card is loaded in real time (no waiting for a day or two for the transaction to hard-post at your bank before you can gain access to it), and then the funds can be withdrawn just like from a real bank, either by Comcheck or with the debit card.