It costs $20 to register a trip code
We accept payment through paypal, as well as bitcoins, vocoins, and diamonds on our official minecraft server.
You could also mail the money to us. (Please do not send paper money or coins worth more than 10 cents each)
To the best of my knowledge the trip code is simply a hash of something. Simply type something into the trip space, and it will give you a unique "ID" when you post. Since it is a hash it is hard to recreate it without the original message.