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To run the SDK a Verisoul Project ID is required. Schedule a call here to get started.

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System Requirements

  • Android 7.0 (API level 24) or higher
  • Kotlin 1.5 or higher
  • Gradle 7.0 or higher

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Installation

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Add Maven Repository

Add these lines to your settings.gradle file. 
dependencyResolutionManagement {
    repositories {
        ...
        maven { url = uri("https://us-central1-maven.pkg.dev/verisoul/android") }
    }
}

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Add Dependency

Add these lines to your build.gradle file.

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For Groovy DSL

dependencies {
  ...
  implementation "ai.verisoul:android:0.4.63"
}

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For Kotlin DSL

dependencies {
  ...
  implementation(libs.verisoul.android)
}
Add these lines to your libs.versions.toml file. Under the [versions] add: 
verisoul = "0.4.63"
Under the [libraries] add: 
verisoul-android = { group = "ai.verisoul", name = "android", version.ref = "verisoul" }

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Usage

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Initialize the SDK

Call init() in your Application class’s onCreate() method. Make sure to register this Application class in your AndroidManifest.xml. Application class: 
import ai.verisoul.sdk.Verisoul
import ai.verisoul.sdk.VerisoulEnvironment

class SampleApplication : Application() {

    override fun onCreate() {
        super.onCreate()

        Verisoul.init(
            this,
            VerisoulEnvironment.Prod, // or VerisoulEnvironment.Sandbox
            "your-project-id"
        )
    }
}
AndroidManifest.xml: 
<manifest>
    <application
        android:name=".SampleApplication">
            ...
    </application>
</manifest>
The init() method initializes the Verisoul SDK with your project credentials. This method must be called once when your application starts. Parameters:
  • context: Your application context
  • environment: The environment to use VerisoulEnvironment.Prod for production or VerisoulEnvironment.Sandbox for testing
  • projectId: Your unique Verisoul project identifier

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Get Session ID

The getSessionId() method returns the current session identifier after the SDK has collected sufficient device data. This session ID is required to request a risk assessment from Verisoul’s API. Important Notes:
  • Session IDs are short-lived and expire after 24 hours
  • The session ID becomes available once minimum data collection is complete (typically within seconds)
  • You should send this session ID to your backend, which can then call Verisoul’s API to get a risk assessment
Example: 
Verisoul.getSessionId(
    callback = object : VerisoulSessionCallback {
        override fun onSuccess(sessionId: String) {
            // Send sessionId to your backend for risk assessment
        }

        override fun onFailure(exception: Exception) {
            // Handle exception
        }
    }
)

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Reinitialize Session

The reinitialize() method triggers session regeneration in the background and resets the SDK’s data collection. This is essential for maintaining data integrity when user context changes. Example: 
Verisoul.reinitialize()
After calling this method, you can call getSessionId() to retrieve the new session identifier: 
Verisoul.getSessionId(
    callback = object : VerisoulSessionCallback {
        override fun onSuccess(sessionId: String) {
            // New session ID is ready
        }
        override fun onFailure(exception: Exception) {
            // Handle exception
        }
    }
)

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Provide Touch Events

In order to gather touch events and compare them to device accelerometer sensor data, the app will need to provide touch events to Verisoul. The way to achieve this is to create BaseActivity, to override dispatchTouchEvent function and pass the data to Verisoul like shown below. 
open class BaseActivity : Activity() {

    override fun dispatchTouchEvent(event: MotionEvent?): Boolean {
        Verisoul.onTouchEvent(event)
        return super.dispatchTouchEvent(event)
    }

    // Other common BaseActivity code...
}
In the application, just use BaseActivity as an Activity base class. 
class MainActivity : BaseActivity() {

    // Other Activity code...
}

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Error Codes

The SDK throws VerisoulException with the following error codes:
Error CodeDescriptionRecommended Action
INVALID_ENVIRONMENTThe environment parameter passed to Verisoul.init() is invalid. Valid values are “dev”, “sandbox”, or “prod”.Ensure the environment parameter is exactly “dev”, “sandbox”, or “prod” (case-sensitive, no whitespace).
SESSION_UNAVAILABLEA valid session ID could not be obtained. This typically occurs when Verisoul’s servers are unreachable due to network blocking or a very slow connection.Implement exponential backoff. Prompt user to check network or disable network blocker.
WEBVIEW_UNAVAILABLEWebView is not available on the device. This can occur when WebView is disabled, missing, uninstalled, or corrupted on the device.Prompt user to enable WebView in settings, update Android System WebView, or switch devices.

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Exception Structure

All errors are thrown as VerisoulException with the following properties:
PropertyTypeDescription
codeStringOne of the error codes above
messageStringHuman-readable error description
causeThrowable?The underlying exception that caused the error (if any)

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Google Play Data Safety

For information on how to complete the Google Play Data Safety section when using the Verisoul SDK, please refer to our Data Safety Instructions.

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Example

For a complete working example, see the Android Sample App.