<key>SCSDKScopes</key>
  <array>
    <string>https://auth.snapchat.com/oauth2/api/user.bitmoji.avatar</string>
    <!-- other scopes you might have... -->
  </array>

// swift

import SCSDKLoginKit

let loginButton = SCSDKLoginButton() { (success : Bool, error : Error?) in
    // do something
}

// objective-c

#import <SCSDKLoginKit/SCSDKLoginKit.h>

SCSDKLoginButton *loginButton =  [[SCSDKLoginButton alloc] initWithCompletion:^(BOOL success, NSError * _Nullable error) {
                                  // do something
                               }];

// swift

import SCSDKLoginKit

SCSDKLoginClient.login(from: viewController) { (success : Bool, error : Error?) in
    // do something
}

// objective-c

#import <SCSDKLoginKit/SCSDKLoginKit.h>

[SCSDKLoginClient loginFromViewController:viewController
                               completion:^(BOOL success, NSError * _Nullable error) {
                                  // do something
                               }];

// swift

import SCSDKLoginKit

func application(
  _ app: UIApplication,
  open url: URL,
  options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
  ...
    if SCSDKLoginClient.application(app, open: url, options: options) {
      return true
    }
  ...
}

// objective-c

#import <SCSDKLoginKit/SCSDKLoginKit.h>

- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
            options:(NSDictionary<UIApplicationOpenURLOptionsKey, id> *)options {
...
              if ([SCSDKLoginClient application:application openUrl:url options:options]) {
                return YES;
              }
...
}

// swift

let graphQLQuery = "{me{displayName, bitmoji{avatar}}}"

let variables = ["page": "bitmoji"]

SCSDKLoginClient.fetchUserData(withQuery: graphQLQuery, variables: variables, success: { (resources: [AnyHashable: Any]?) in
  guard let resources = resources,
    let data = resources["data"] as? [String: Any],
    let me = data["me"] as? [String: Any] else { return }

  let displayName = me["displayName"] as? String
  var bitmojiAvatarUrl: String?
  if let bitmoji = me["bitmoji"] as? [String: Any] {
    bitmojiAvatarUrl = bitmoji["avatar"] as? String
  }
}, failure: { (error: Error?, isUserLoggedOut: Bool) in
	// handle error
})

// objective-c

NSString *graphQLQuery = @"{me{displayName, bitmoji{avatar}}}";

NSDictionary *variables = @{@"page": @"bitmoji"};

[SCSDKLoginClient fetchUserDataWithQuery:graphQLQuery
                               variables:variables
                                 success:^(NSDictionary *resources) {
                                   NSDictionary *data = resources[@"data"];
                                   NSDictionary *me = data[@"me"];
                                   NSString *displayName = me[@"displayName"];
                                   NSDictionary *bitmoji = me[@"bitmoji"];
                                   NSString *bitmojiAvatarUrl = bitmoji[@"avatar"];
                               } failure:^(NSError * error, BOOL isUserLoggedOut) {
                                   // handle error as appropriate
                               }];

// swift

let graphQLQuery = "{me{externalId}}"

SCSDKLoginClient.fetchUserData(withQuery: graphQLQuery, variables: nil, success: { (resources: [AnyHashable: Any]?) in
  guard let resources = resources,
    let data = resources["data"] as? [String: Any],
    let me = data["me"] as? [String: Any] else { return }

  let externalId = me["externalId"] as? String
}, failure: { (error: Error?, isUserLoggedOut: Bool) in
	// handle error
})

// objective-c

NSString *graphQLQuery = @"{me{externalId}}";

[SCSDKLoginClient fetchUserDataWithQuery:graphQLQuery
                               variables:nil
                  success:^(NSDictionary *resources) {
                    NSDictionary *data = resources[@"data"];
                    NSDictionary *me = data[@"me"];
                    NSString *externalId = me[@"externalId"];
} failure:^(NSError * error, BOOL isUserLoggedOut) {
  // handle error as appropriate
}];

// swift

import SCSDKLoginKit

SCSDKLoginClient.unlinkCurrentSessionWithCompletion { (success: Bool) in
  // do something
}

// objective-c

#import <SCSDKLoginKit/SCSDKLoginKit.h>

[SCSDKLoginClient unlinkCurrentSessionWithCompletion:^(BOOL success) {
  // do something
}];

// swift

import SCSDKLoginKit

SCSDKLoginClient.unlinkAllSessionsWithCompletion { (success: Bool) in
  // do something
}

// objective-c

#import <SCSDKLoginKit/SCSDKLoginKit.h>

[SCSDKLoginClient unlinkAllSessionsWithCompletion:^(BOOL success) {
  // do something
}];

repositories {
   maven {
       url "https://storage.googleapis.com/snap-kit-build/maven"
   }
}

repositories {
   maven {
       url "https://raw.githubusercontent.com/Snap-Kit/release-maven/repo"
   }
}

dependencies {
   ...
   implementation([
           'com.snapchat.kit.sdk:login:1.1.4',
           'com.snapchat.kit.sdk:core:1.1.4'
   ])
}

<uses-permission android:name="android.permission.INTERNET" />

<application ...>
   <meta-data android:name="com.snapchat.kit.sdk.clientId" android:value="your app’s client id" />
   <meta-data android:name="com.snapchat.kit.sdk.redirectUrl" android:value="the url that will handle login completion" />
   <meta-data android:name="com.snapchat.kit.sdk.scopes" android:resource="@array/snap_connect_scopes" /> <!-- This should be a string array of scopes !-->

   ...

   <activity
       android:name="com.snapchat.kit.sdk.SnapKitActivity"
       android:launchMode="singleTask"
       >
       <intent-filter>
           <action android:name="android.intent.action.VIEW" />
           <category android:name="android.intent.category.DEFAULT" />
           <category android:name="android.intent.category.BROWSABLE" />
           <!--
               Enter the parts of your redirect url below
               e.g., if your redirect url is myapp://snap-kit/oauth2
                   android:scheme="myapp"
                   android:host="snap-kit"
                   android:path="oauth2"
           !-->
           <data
               android:scheme="the scheme of your redirect url"
               android:host="the host of your redirect url"
               android:path="the path of your redirect url"
               />
       </intent-filter>

   </activity>

   ...
</application>

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="snap_connect_scopes">
        <item>https://auth.snapchat.com/oauth2/api/user.bitmoji.avatar</item>
    </string-array>
</resources>

import com.snapchat.kit.sdk.SnapLogin;

View mLoginButton = SnapLogin.getButton(getContext(), (ViewGroup)mViewRoot);

View yourView = findViewById(...);
yourView.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick() {
        SnapLogin.getAuthTokenManager(this).startTokenGrant();
   }
});

// Import needed for LoginStateController
import com.snapchat.kit.sdk.core.controller.LoginStateController;

final LoginStateController.OnLoginStateChangedListener mLoginStateChangedListener =
    new LoginStateController.OnLoginStateChangedListener() {
        @Override
        public void onLoginSucceeded() {
            // Here you could update UI to show login success
        }

        @Override
        public void onLoginFailed() {
            // Here you could update UI to show login failure
        }

        @Override
        public void onLogout() {
            // Here you could update UI to reflect logged out state
        }
    };

// Add the LoginStateChangedListener you’ve defined to receive LoginInState updates
SnapLogin.getLoginStateController(getContext()).addOnLoginStateListener(mLoginStateChangedListener);

```java

To unsubscribe your `LoginStateChangedListener` from updates, use the following line:

```java
SnapLogin.getLoginStateController(this).removeOnLoginStateChangedListener(mLoginStateChangedListener);

boolean isUserLoggedIn = SnapLogin.isUserLoggedIn(getContext());

String query = "{me{bitmoji{avatar},displayName}}";
String variables = null;
SnapLogin.fetchUserData(this, query, variables, new FetchUserDataCallback() {
    @Override
    public void onSuccess(@Nullable UserDataResponse userDataResponse) {
        if (userDataResponse == null || userDataResponse.getData() == null) {
            return;
        }

        MeData meData = userDataResponse.getData().getMe();
        if (meData == null) {
            return;
        }

        mNameTextView.setText(userDataResponse.getData().getMe().getDisplayName());

        if (meData.getBitmojiData() != null) {
            Glide.with(getContext())
                    .load(meData.getBitmojiData().getAvatar())
                    .into(mBitmojiImageView);
        }
    }

    @Override
    public void onFailure(boolean isNetworkError, int statusCode) {

    }
});

String query = "{me{externalId}}";
SnapLogin.fetchUserData(this, query, null, new FetchUserDataCallback() {
    @Override
    public void onSuccess(@Nullable UserDataResponse userDataResponse) {
        if (userDataResponse == null || userDataResponse.getData() == null) {
            return;
        }

        MeData meData = userDataResponse.getData().getMe();
        if (meData == null) {
            return;
        }

        mBackend.save(userDataResponse.getData().getMe().getExternalId());
    }

    @Override
    public void onFailure(boolean isNetworkError, int statusCode) {

    }
});

SnapLogin.getAuthTokenManager(this).revokeToken();

/********************** HTML EXAMPLE **********************/
<html lang="en">
  <body>
    <div id="my-login-button-target" />
  </body>
</html>

/********************** HTML EXAMPLE **********************/
<html lang="en">
  <body>
    <div id="my-login-button-target" />
    <script>
      // Load the SDK asynchronously
      (function (d, s, id) {
        var js, sjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "https://sdk.snapkit.com/js/v1/login.js";
        sjs.parentNode.insertBefore(js, sjs);
      }(document, 'script', 'loginkit-sdk'));
    </script>
  </body>
</html>

window.snapKitInit = function () { /* Add your code here */ }

/********************** HTML EXAMPLE **********************/
<html lang="en">
  <body>
    <div id="my-login-button-target" />
    <script>
       window.snapKitInit = function () {
        var loginButtonIconId = 'my-login-button-target';
        // Mount Login Button
        snap.loginkit.mountButton(loginButtonIconId, {
          clientId: 'your-clientId',
          redirectURI: 'your-redirectURI',
          scopeList: [
            'user.display_name',
            'user.bitmoji.avatar',
          ],
          handleResponseCallback: function() {
            snap.loginkit.fetchUserInfo()
              .then(data => console.log('User info:', data));
          },
        });
      };

      // Load the SDK asynchronously
      (function (d, s, id) {
        var js, sjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "https://sdk.snapkit.com/js/v1/login.js";
        sjs.parentNode.insertBefore(js, sjs);
      }(document, 'script', 'loginkit-sdk'));
    </script>
  </body>
</html>

var loginButtonIconId = 'my-login-button-target';
var loginParamsObj = {
  // Override this parameter `handleAuthGrantFlowCallback`
  handleAuthGrantFlowCallback:
    function handleAuthGrantFlowCallback(){
      // TO START THE OAUTH2.0 AUTHORIZATION
      // GRANT FLOW, POINT THIS CALLBACK TO
      // YOUR APPLICATION’S BACKEND HANDLER
    },
  clientId: 'your-clientId',
  redirectURI: 'your-redirectURI', // REMOVE THIS
  scopeList: ['your-scope(s)'], // REMOVE THIS
};

// ******************** Crypto Library Helper ***************************
var _crypto = require('crypto');

var OAUTH2_STATE_BYTES = 32;
var REGEX_PLUS_SIGN = /\+/g;
var REGEX_FORWARD_SLASH = /\//g;
var REGEX_EQUALS_SIGN = /=/g;

/*
 * This function generates a random amount of bytes using the
 * crypto library
 *
 * @param {int} size - The number of random bytes to generate.
 *
 * @returns {Buffer} The generated number of bytes
 */
var generateRandomBytes = function generateRandomBytes(size) {
  return _crypto.randomBytes(size);
};

/*
 * This function encodes the given byte buffer into a base64 URL
 * safe string.
 *
 * @param {Buffer} bytesToEncode - The bytes to encode
 *
 * @returns {string} The URL safe base64 encoded string
 */
var generateBase64UrlEncodedString = function generateBase64UrlEncodedString(bytesToEncode) {
  return bytesToEncode
    .toString('base64')
    .replace(REGEX_PLUS_SIGN, '-')
    .replace(REGEX_FORWARD_SLASH, '_')
    .replace(REGEX_EQUALS_SIGN, '');
};

/*
 * This function generates the state required for both the
 * OAuth2.0 Authorization and Implicit grant flow
 *
 * @returns {string} The URL safe base64 encoded string
 */
var generateClientState = exports.generateClientState = function generateClientState() {
  return generateBase64UrlEncodedString(
    generateRandomBytes(OAUTH2_STATE_BYTES)
  );
};

// ******************** URL Builder Helper ***********************

var _qs = require('qs'); // Will need to 'npm install qs'

var getAuthCodeRedirectURL = function getAuthCodeRedirectURL(clientId, redirectUri, scopeList, state) {
  var SNAP_ACCOUNTS_LOGIN_URL = 'https://accounts.snapchat.com/accounts/oauth2/auth';
  var scope = scopeList.join(' ');
  var loginQS = {
    client_id: clientId,
    redirect_uri: redirectUri,
    response_type: 'code',
    scope: scope,
    state: state
  };

  var stringifyLoginQS = _qs.stringify(loginQS);
  return SNAP_ACCOUNTS_LOGIN_URL + '?' + stringifyLoginQS;
};

// ******************** ExpressJS Server Main Logic ************************

var express = require('express'); // Will need to 'npm install express'
var app = express();

var clientId = 'my-assigned-client-id';
var clientSecret = 'my-assigned-client-secret';
var redirectUri = 'https://my-redirect-uri.com';
var scopeList = ['https://auth.snapchat.com/oauth2/api/example.abc', 'https://auth.snapchat.com/oauth2/api/example.xyz'];

app.get('/send-oauth-GET-request-step-two', function(req, res){
  // Generate query parameters
  var state = generateClientState();

  // Build redirect URL
  var getRedirectURL = getAuthCodeRedirectURL(clientId, redirectUri, scopeList, state);

  // Redirect user to get consent
  res.redirect(getRedirectURL);
});

app.listen(3000);

<redirect_uri>?code=123Abx23kdjfhdfjdf2&state=StYxxll233jdfjdlf

// Success Response Body
{
    access_token: <string>,
    refresh_token: <string>,
    expires_in: <time in seconds>
}

// Error Response Body
{
    error: <ascii error code>,
    error_description: <human readable error description>
}

// ******************** ExpressJS Server Main Logic ************************

var express = require('express'); // will need to 'npm install express'
var request = require('request'); // will need to 'npm install request'

var app = express();

var clientId = 'my-assigned-client-id';
var clientSecret = 'my-assigned-client-secret';

var redirectUri = 'https://my-redirect-uri.com';
var scopeList = ['https://auth.snapchat.com/oauth2/api/example.abc', 'https://auth.snapchat.com/oauth2/api/example.xyz'];

app.get('/send-oauth-GET-request-step-two', function(req, res){
   // ..
});

app.get('/send-access-token-POST-request-step-five', function(req, res) {
  var SNAPCHAT_AUTH_ENDPOINT = 'https://accounts.snapchat.com/accounts/oauth2/token';
  var auth_code = 'received-auth-code-xyz';

  var authorizationHeader = clientId + ':' + clientSecret;
  var authorizationHeaderBase64 = Buffer.from(authorizationHeader).toString('base64');

  // Set headers
  var headers = {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Authorization': 'Basic ' + authorizationHeaderBase64
  }

  // Configure access token POST request
  var options = {
    url: SNAPCHAT_AUTH_ENDPOINT,
    method: 'POST',
    headers: headers,
    form:{
      grant_type: 'authorization_code',
      code: auth_code,
      redirect_uri: redirectUri,
      client_id: clientId,
    }
  };

  // Start POST request
  request(options, function (error, response, body) {
      // Handle success and error responses here
      // Make sure to persist access_token, refresh_token, and expires_in
      res.send(response)
  })
});

app.listen(3000);

// Success Response Body
{
    access_token: <string>,
    refresh_token: <string>,
    expires_in: <time in seconds>
}

// Error Response Body
{
    error: <ascii error code>,
    error_description: <human readable error description>
}

// ******************** ExpressJS Server Main Logic ************************

var express = require('express'); // will need to ‘npm install express`
var request = require('request'); // will need to ‘npm install request`

var app = express();

var clientId = 'my-assigned-client-id';
var clientSecret = 'my-assigned-client-secret';

var redirectUri = 'https://my-redirect-uri.com';
var scopeList = ['https://auth.snapchat.com/oauth2/api/example.abc', 'https://auth.snapchat.com/oauth2/api/example.xyz'];

app.get('/send-oauth-GET-request-step-two', function(req, res){
   // ..
});

app.get('/send-access-token-POST-request-step-five', function(req, res) {
  // ..
});

app.get('/send-refresh-token-POST-request-step-six', function(req, res) {
  var SNAPCHAT_AUTH_ENDPOINT = 'https://accounts.snapchat.com/accounts/oauth2/token';

  var authorizationHeader = clientId + ':' + clientSecret;
  var authorizationHeaderBase64 = Buffer.from(authorizationHeader).toString('base64');

  // Set headers
  var headers = {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Authorization': 'Basic ' + authorizationHeaderBase64
  }

  // Configure refresh token POST request
  var options = {
    url: SNAPCHAT_AUTH_ENDPOINT,
    method: 'POST',
    headers: headers,
    form:{
      grant_type: 'refresh_token',
      refresh_token: refresh_token, // refresh_token is value from step six
    }
  };

  // Start POST request
  request(options, function (error, response, body) {
      // Handle success and error responses here
      // Persist new access_token, refresh_token, and expires_in values
      res.send(response)
  })
});

app.listen(3000);

// ******************** ExpressJS Server Main Logic ************************

var express = require('express'); // Will need to 'npm install express'
var request = require('request'); // Will need to 'npm install request'

var app = express();

var clientId = 'my-assigned-client-id';
var clientSecret = 'my-assigned-client-secret';

var redirectUri = 'https://my-redirect-uri.com';
var scopeList = ['https://auth.snapchat.com/oauth2/api/example.abc', 'https://auth.snapchat.com/oauth2/api/example.xyz'];

app.get('/send-oauth-GET-request-step-two', function(req, res){
   // ..
});

app.get('/send-access-token-POST-request-step-five', function(req, res) {
  // ..
});

app.get('/send-refresh-token-POST-request-step-six', function(req, res) {
  // ..
});

app.get('/send-revoke-token-POST-request-step-seven', function(req, res) {
  var SNAPCHAT_AUTH_REVOKE_ENDPOINT = 'https://accounts.snapchat.com/accounts/oauth2/revoke';

  var authorizationHeader = clientId + ':' + clientSecret;
  var authorizationHeaderBase64 = Buffer.from(authorizationHeader).toString('base64');

  // Set headers
  var headers = {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Authorization': 'Basic ' + authorizationHeaderBase64,
  }

  // configure refresh token POST request
  var options = {
    url: SNAPCHAT_AUTH_REVOKE_ENDPOINT,
    method: 'POST',
    headers: headers,
    form:{
      token: refresh_token, // refresh_token is value from step six
    }
  };

  // Start POST request
  request(options, function (error, response, body) {
      // Clear access_token, refresh_token, and expires_in values
      res.send(response)
  })
});

app.listen(3000);

snap.loginkit.mountButton(loginButtonDivId, loginParams, accessToken);