// Config
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [DDSlackWebhookClient withWebhookURL:[NSURL URLWithString:@""]];
    
    return YES;
}

// Post
[[DDSlackWebhookClient sharedClient] postNotificationToChannel:nil
                                                          text:nil
                                                      username:nil
                                                       iconURL:nil
                                                     iconEmoji:nil
                                                    completion:nil];