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Requirements

  • The compileSdk version should be 35.
  • The minimum SDK version supported by the SDK is 21.

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Overview

OTPless SDK accepts the user’s identity (phone number or email), authenticates through multiple channels, and returns a secure token upon success.The merchant app sends this token to its backend, which verifies it with the OTPless Server before proceeding with the user journey. SDK Overview Chart

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Integration Steps

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Step 1: Add SDK Dependency

Add the following dependency in your app’s build.gradle. 
  implementation ("io.github.otpless-tech:otpless-loginpage-android:1.1.1")

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Step 2: Update AndroidManifest.xml

Add this intent filter to your LoginActivity in AndroidManifest.xml: 
<intent-filter>
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.BROWSABLE" />
    <category android:name="android.intent.category.DEFAULT" />
    <data
        android:scheme="otpless.your_appid_in_lowercase"
        android:host="otpless" />
</intent-filter>
Replace YOUR_APP_ID with your actual App ID provided in your OTPLESS dashboard.
🔍 Example: If your App ID is “AcmeApp123”, scheme becomes otpless.acmeapp123
Additionally, ensure your activity is set to singleTop launch mode and that the exported attribute is true: 
android:launchMode="singleTop"
android:exported="true"

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Silent Network Authentication (SNA) Setup

  • Make sure that Silent Network Authentication is enabled on the OTPLESS dashboard.
  • Once you have successfully integrated OTPLESS Android SDK in your application, you only have to add the following line in your app’s AndroidManifest file in the <application> tag:
android:networkSecurityConfig="@xml/otpless_network_security_config"

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Step 3: Configure your SignIn/SignUp Activity

Import the OtplessController class
Kotlin
import com.otpless.loginpage.main.OtplessController
Declare a otplessController member in your SignIn/SignUpActivity
Kotlin
private lateinit var otplessController: OtplessController
Assign the member in onCreate of your SignIn/SignUpActivity, initialize the otplessController and register the callback response method. On initialization is success callback is given in callback method.
Kotlin
otplessController = OtplessController.getInstance(this)
otplessController.initializeOtpless(OTPLESS_APP_ID){ 
   // callback
}
otplessController.registerResultCallback(this::onAuthResponse)
Override your SignIn/SignUpActivity onNewIntent and forward the new Intent to otplessController. 
override fun onNewIntent(intent: Intent) {
    super.onNewIntent(intent)
    otplessController.onNewIntent(this, intent)
}

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Step 4: Starting otpless

Call startOtplessWithLoginPage method from otplessController to start otpless login page.
  • Start
  • Start with Phone
  • Start with Email
Kotlin
coroutineScope.launch {
    // Prepare query parameters map for login (optional)
    otplessController.startOtplessWithLoginPage()
}
// show progress screen

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Step 5: Handle auth response

Extract token from authResponse and validate token with backend apis. Backend documentation
Kotlin
import com.otpless.loginpage.model.OtplessResult

private fun onAuthResponse(authResponse: OtplessResult) {
    when(authResponse) {
        is OtplessResult.Success -> {
            // handle success case
        }
        is OtplessResult.Error -> {
            when(authResponse.errorType) {
                ErrorType.INITIATE -> {
                    when(authResponse.errorCode) {
                        10_000 -> {
                            // handle user cancelled (User clicked on back button)
                        }
                        10_001 -> {
                            // handle user cancelled (User clicked on help button)
                        }
                        10_002 -> {
                            // handle user cancelled (User clicked on phone number change button)
                        }
                        7102 -> {
                            // handle invalid phone
                        }
                        7104 -> {
                            // handle invalid email
                        }
                        9120 -> {
                            // SDK not initialized
                        }
                        9125, 5050 -> {
                            // SDK Loading error
                        }
                        
                    }
                }
                ErrorType.NETWORK -> {
                    // errorCode internet is not available 9103
                    when(authResponse.errorCode) {
                        9103 -> {
                            // handle internet error
                        }
                    }
                }
                ErrorType.VERIFY -> {
                    // handle custom error
                }
            }
        }
    }
}

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Step 6: Closing otpless

When your login page is closed or login is successful, close the otplessController.
Kotlin
otplessController.closeOtpless()

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Step 7: Tracking Multiple Events

You can observe all events using: 
OtplessEventManager.observerEvents { eventData: OtplessEventData ->
    // Handle eventData here
}
To track and handle specific event categories, use: 
OtplessEventManager.observerEvents { eventData: OtplessEventData ->
    when(eventData.category) {
        EventCategory.LOAD -> {
            // track url success loading action
        }
        EventCategory.CLICK -> {
            // track user action
        }
        EventCategory.ACTION -> {
            // track actions with metadata
        }
    }
}

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Sample Event JSON Payloads

  • ACTION
  • CLICK
  • LOAD
  • INITIATE
  • VERIFY_ERROR
  • OTP_AUTO_READ
  • DELIVERY_STATUS
  • FALLBACK_TRIGGERED
{
  "event": "ACTION",
  "type": "INITIATE",
  "metaData": {
    "requestId": "abc123xyz",
    "channel": "OTP/SILENT_AUTH",
    "authType": "OTP/SILENT_AUTH",
    "deliveryChannel": "OTP/SILENT_AUTH"
  }
}

Validate ID Token

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

Validate Token (Opaque)

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