What is the name of this movie? (Possibly a Disney movie or was shown on Disney)?

i dont think its right but i can only think of blank check. a kid gets hit by a car and the guy that hit him gives him a blank check. he makes it out for a million dollars. it gets cashed and he buys a huge house he fills with toys and stuff. he uses a computer to talk to people so they dont think hes a kid. then the guy that hit him tries to kill him or hurt him. he throws a party at the end and his parents find out and he gets in trouble.