Daily Commissions are simple missions you can get from the commission droid in every Trade City, which give you credits upon completion.
To get a new Commission you must right-click on the droid. You will then be prompted in chat to select if you want a new commission.
Every accepted commission will show up in your /journal.
You can accept up to 3 commissions every 24 hours.
Every day that you complete commissions sets you on a streak, which increases payouts the more you do them up to a maximum amount of 15,000. The streak never expires, so the more commissions you do the more money you make.