Pacific Poker bonus codes appear to be necessary to receive a 20% Pacific Poker sign up bonus when you are in the process of opening an account. Pacific Poker bonus code would be necessary would be when somebody such as a friend refers you and they do not have a special coded clickable URL to give you. So they give you a bonus code which allows Pacific Poker to track who the referring source would be, namely your friend or person that turned you on to Pacific Poker so that person would be eligible for a referral bonus for sending you to Pacific Poker.