Get query params on launching app

gistfile1.txt

-(BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {
    NSLog(@"Opened by url %@", url.query);
    NSDictionary *params = [self parseURL:url];
    for(id key in params)
        NSLog(@"key=%@ value=%@", key, [params objectForKey:key]);
    
    NSString *amount = [params objectForKey:@"amount"];
    self.amount = [amount intValue];
    
    [[NSUserDefaults standardUserDefaults] setObject:amount forKey:@"amount"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    
    return YES;
}