dont worry about it i got have my own id card there pretty sweet and easy to get only 10 bucks if your underage also. but if hes pays you with a money order he cant recall cash? lollol but ya you are totally safe, plus like ive said a ton of times to other people i doubt they will sue you for the little amount of money your charging for an account it would probably end up costing them more money then they lost. Plus your 100 percent legit so you have nothing to worry about. Enjoy =]
Also you might wanna black out the exact adress and last name a lil bit so he doesnt rape your underaged ass =P