ipm+parse-auth.m

- (void)myMethod {
    PFUser *user = [PFUser user];
    user.username = @"my name";
    user.password = @"my pass";
    user.email = @"email@example.com";

    // other fields can be set just like with PFObject
    user[@"phone"] = @"415-392-0202";

    [user signUpInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
      if (!error) {
      // Now that they've authenticated with Parse, we can 'login' via IPM
              [[IPMessagingManager sharedManager] loginWithIdentity:user.username];

      } else {   NSString *errorString = [error userInfo][@"error"];   // Show the errorString somewhere and let the user try again.
      }
    }];
}

- (BOOL)loginWithIdentity:(NSString *)identity {
    if (self.client) {
        [self logout];
    }
    
    [self storeIdentity:identity];
    
    NSString *token = [self tokenForIdentity:identity];
    self.client = [TwilioIPMessagingClient ipMessagingClientWithToken:token
                                                             delegate:nil];
    
    return YES;
}