… Its not easy to get.
GRU Free Wifi limits to 1h every 24h.
Which sucks when you are stuck.
To pay per paypal failed too.
Go to Terminal 2 sit close to the Starbucks counter (when you enter Terminal2 go to the left side) and signin with your browser and google or facebook account.
I was not able to book a ticket directly with TAM or GOL Website.
(Both gave me errors)
I used the Skyscanner App and it redirected me to Tripster, which seems to have done the booking.
(Got an email within 10min)
I will find out soon if it worked.
(Booking and flying on the same day)