Amazon Cognito - Simple and Secure User Sign Up & Sign In | Amazon Web Servi...

• iOS Objective C

  
• Android

  
• iOS Swift

  
• React Native

  
• Web Apps

  

• Sign in users and get back tokens using the SDKs and a few lines of code.

  // iOS Objective-C
  // AppDelegate.m
  - (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey, id> *)options {
    return [[AWSCognitoAuth defaultCognitoAuth] application:app openURL:url options:options];
  }
  // ViewController.m
  AWSCognitoAuth * cognitoAuth = [AWSCognitoAuth defaultCognitoAuth];
  [cognitoAuth getSession:self completion:^(AWSCognitoAuthUserSession * _Nullable session, NSError * _Nullable error) {
    if(error) {
      NSLog(@"Error: %@", error.userInfo[@"error"]);
    } else {
      //Do something with session
      NSLog(@"Claims: %@", t.result.idToken.claims);       
    }
  }];

If you are using Amazon Cognito Identity to create a User Pool, you pay based on your monthly active users (MAUs) only. A user is counted as a MAU if, within a calendar month, there is an identity operation related to that user, such as sign-up, sign-in, token refresh, password change, or a user account attribute is updated. You are not charged for subsequent sessions or for inactive users within that calendar month.