private static void demoUsers(CoinbaseAccountService accountService) throws IOException {
CoinbaseUsers users = accountService.getCoinbaseUsers();
System.out.println("Current User: " + users);
CoinbaseUser user = users.getUsers().get(0);
user.updateTimeZone("Tijuana").updateNativeCurrency("MXN");
user = accountService.updateCoinbaseUser(user);
System.out.println("Updated User: " + user);
CoinbaseUser newUser = CoinbaseUser.createCoinbaseNewUserWithReferrerId("demo@demo.com", "pass1234", "527d2a1ffedcb8b73b000028");
String oauthClientId = ""; // optional
CoinbaseUser createdUser = accountService.createCoinbaseUser(newUser, oauthClientId);
System.out.println("Newly created user: " + createdUser);
}