A lot of people seem to be confused by the sign up process for 3S. Only one person needs to sign up for 3S teams. That’s why the fee for the team tournament is 20 dollars. One person needs to front up the money electronically for both players and the other person just teams up with you after the fact at Evo. Tournament entry regularly is 10 dollars per player so the 20 dollars is just to cover your eventual patner. The other person only needs to have an Evo Badge. Which means they need to have already purchased the 30/50 dollar registration to enter the event as an official tournament player via Paypal online. If they have not done that they are not allowed to be your patner. All of that being as far as I know.
If all is done correctly though (both of you registered for Evo online to receive Evo badges) the payment process is between the players. Either you’re super nice and front the money for both players or you ask your partner for 10 dollars at Evo.
Now that I read your post though it sounds like you’re out of luck since you didn’t register and won’t receive an Evo badge as an official tournament player.