​
Step 1: Install OTPLESS SDK Dependency

Install the OTPLESS SDK dependency by running the following command in your terminal at the root of your Flutter project:

flutter pub add otpless_flutter:2.1.5
flutter pub get

​
Step 2: Platform-specific Integrations

  1. Add intent filter inside your android/app/src/main/AndroidManifest.xml file into your Main activity code block:
<intent-filter>
  <action android:name="android.intent.action.VIEW" />
  <category android:name="android.intent.category.DEFAULT" />
  <category android:name="android.intent.category.BROWSABLE" />
  <data
      android:host="otpless"
      android:scheme= "otpless.{{YOUR_APP_ID}}"/>
</intent-filter>

Replace YOUR_APP_ID with your actual App ID provided in your OTPLESS dashboard.

  1. Change your activity launchMode to singleTop and exported true for your Main Activity:
android:launchMode="singleTop"
android:exported="true"
  1. Add the following override method in android/app/src/main/kotlin/MainActivity.kt to handle callback:
  • Import the following classes:
import com.otpless.otplessflutter.OtplessFlutterPlugin;
import android.content.Intent;
  • Add this code to your onNewIntent() method in your main activity:
override fun onNewIntent(intent: Intent) {
    super.onNewIntent(intent)
    val plugin = flutterEngine?.plugins?.get(OtplessFlutterPlugin::class.java)
    if (plugin is OtplessFlutterPlugin) {
        plugin.onNewIntent(intent)
    }
}
  • Add this code to your onBackPressed() method in your main activity:
override fun onBackPressed() {
    val plugin = flutterEngine?.plugins?.get(OtplessFlutterPlugin::class.java)
    if (plugin is OtplessFlutterPlugin) {
      if (plugin.onBackPressed()) return
  }
  // handle other cases
  super.onBackPressed()
}

​
Step 3: Configure Sign up/Sign in

  1. Import the OTPLESS package on your login page.
login_page.dart
import 'package:otpless_flutter/otpless_flutter.dart';
  1. Add OTPLESS instance and declare the variable with YOUR_APP_ID
login_page.dart
final _otplessFlutterPlugin = Otpless();
var arg = {
    'appId': '{{YOUR_APP_ID}}',
};

Replace YOUR_APP_ID with your actual App ID provided in your OTPLESS dashboard.

  1. Add the following code to Initiate OTPLESS Login Page
login_page.dart
_otplessFlutterPlugin.openLoginPage((result) {
    var message = "";
    if (result['data'] != null) {
        final token = result['response']['token'];
        message = "token: $token";
    } else {
        message = result['errorMessage'];
    }
}, arg);

🏁 Checkpoint

To ensure a smooth integration process:

  1. Deploy your app/website with the included OTPLESS SDK.
  2. Conduct tests to verify the sign-in flow functions correctly.
  3. Ensure that after a successful sign-in, the user is redirected back to your app/website and their information is correctly logged in the console.

​
User Information JSON

The structure of the user information returned upon successful sign-in is as follows:

{
  "token": "unique_token_here",
  "userId": "unique_user_id_here",
  "timestamp": "ISO_timestamp_here",
  "identities": [
    {
      "identityType": "EMAIL",
      "identityValue": "user@example.com",
      "channel": "GMAIL",
      "methods": ["OAUTH"],
      "name": "User Name",
      "verified": "true",
      "verifiedAt": "ISO_timestamp_here",
      "isCompanyEmail": "true"
    },
    ...
  ],
  ...
}

​
Next Steps

Validate Token

Learn how to securely `validate token` returned by OTPLESS flutter SDK to ensure the authenticity of sign-in events from your backend server.

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