Sao Paulo has 2 airports, the International one, named Guarulhos (GRU) and the National one, Congonhas (CGH). All International Flights arrives on the International one. From Congonhas you may have the shuttle service to Rio de Janeiro, among other domestic flights.
It is recommended that you use offical taxi service to the Hotel or FAAP facilities.The official taxis at the International Airport are colored - white and blue. Only these ones are allowed to take passengers from International Airport. They have a large counter, located on the exit of the Airport. Guarulhos International Airport has two terminals and on the exit from both terminals you have a taxi counter. There with the address of your destination - it may be the FAAP University or any Hotel, they sell you a ticket for the taxi, and you should pay at this counter. You can pay even with your Credit Card (accepts at least Visa, MasterCard and Amex - Discovery is NOT accept in Brazil). According to Brazilian law, you can pay with your International Credit Card, but prices are stated in Reals (actual rate 1 USD=R$ 2,40). If you arrive at the Airport it will not be difficult to get an info and to have someone who is also taking a taxi - it is impossible to exit the Airport and not see their counter