Android Kotlin Identity Verification SDK: KYC

dependencyResolutionManagement {
    repositories {
        google()
        mavenCentral()
        maven { url = uri("https://raw.githubusercontent.com/didit-protocol/sdk-android/main/repository") }
    }
}

dependencyResolutionManagement {
    repositories {
        google()
        mavenCentral()
        maven { url "https://raw.githubusercontent.com/didit-protocol/sdk-android/main/repository" }
    }
}

dependencies {
    implementation("me.didit:didit-sdk:4.15.1")
}

dependencies {
    implementation "me.didit:didit-sdk:4.15.1"
}

android {
    packaging {
        resources {
            excludes += "META-INF/versions/9/OSGI-INF/MANIFEST.MF"
        }
    }
}

import me.didit.sdk.DiditSdk

class MyApp : Application() {
    override fun onCreate() {
        super.onCreate()
        DiditSdk.initialize(this)
    }
}

import me.didit.sdk.DiditSdk
import me.didit.sdk.DiditSdkState
import me.didit.sdk.VerificationResult

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // Observe SDK state to launch UI when ready
        lifecycleScope.launch {
            DiditSdk.state.collect { state ->
                when (state) {
                    is DiditSdkState.Ready -> DiditSdk.launchVerificationUI(this@MainActivity)
                    is DiditSdkState.Error -> Log.e("Didit", "Error: ${state.message}")
                    else -> { /* Loading, Idle, CreatingSession */ }
                }
            }
        }
    }

    private fun startVerification() {
        // Method 1: UniLink (no backend required)
        DiditSdk.startVerification(
            workflowId = "your-workflow-id",
            vendorData = "user-123"
        ) { result ->
            handleResult(result)
        }

        // Method 2: Backend Session (recommended for production)
        // DiditSdk.startVerification(
        //     token = "your-session-token"
        // ) { result ->
        //     handleResult(result)
        // }
    }

    private fun handleResult(result: VerificationResult) {
        when (result) {
            is VerificationResult.Completed -> {
                Log.d("Didit", "Session: ${result.session.sessionId}")
                Log.d("Didit", "Status: ${result.session.status}")
            }
            is VerificationResult.Cancelled -> {
                Log.d("Didit", "User cancelled")
            }
            is VerificationResult.Failed -> {
                Log.e("Didit", "Failed: ${result.error.message}")
            }
        }
    }
}

DiditSdk.startVerification(
    workflowId = "your-workflow-id",
    vendorData = "user-123"
) { result ->
    handleResult(result)
}

// Your backend creates a session and returns the token
val sessionToken = yourBackend.createVerificationSession(userId = currentUser.id)

// Pass the token to the SDK
DiditSdk.startVerification(
    token = sessionToken
) { result ->
    handleResult(result)
}

import me.didit.sdk.Configuration
import me.didit.sdk.core.localization.SupportedLanguage

val configuration = Configuration(
    languageLocale = SupportedLanguage.SPANISH,  // Force Spanish language
    showLanguageSelector = true,                  // Let the user change language
    fontFamily = "my_custom_font",                // Custom font (must be in res/font/)
    loggingEnabled = true                         // Enable debug logging
)

DiditSdk.startVerification(
    token = "your-session-token",
    configuration = configuration
) { result ->
    handleResult(result)
}

val configuration = Configuration(
    defaultLivenessCamera = CameraLens.BACK,
    showLivenessCameraSwitchButton = false
)

// Use device locale (default)
val config = Configuration()

// Force specific language
val config = Configuration(languageLocale = SupportedLanguage.FRENCH)

// Let the user change language on the welcome screen
val config = Configuration(showLanguageSelector = true)

DiditSdk.startVerification(token = "your-token") { result ->
    when (result) {
        is VerificationResult.Completed -> {
            when (result.session.status) {
                VerificationStatus.APPROVED -> {
                    Log.d("Didit", "Approved! Session: ${result.session.sessionId}")
                    // User is verified - grant access
                }
                VerificationStatus.PENDING -> {
                    Log.d("Didit", "Under review. Session: ${result.session.sessionId}")
                    // Show "verification in progress" UI
                }
                VerificationStatus.DECLINED -> {
                    Log.d("Didit", "Declined. Session: ${result.session.sessionId}")
                    // Handle declined verification
                }
            }
        }
        is VerificationResult.Cancelled -> {
            Log.d("Didit", "Cancelled: ${result.session?.sessionId ?: "unknown"}")
            // User chose to cancel - maybe show retry option
        }
        is VerificationResult.Failed -> {
            Log.e("Didit", "Error: ${result.error.message}")
            // Handle error - show retry or contact support
        }
    }
}

lifecycleScope.launch {
    DiditSdk.state.collect { state ->
        when (state) {
            is DiditSdkState.Idle -> {
                // Ready to start verification
            }
            is DiditSdkState.CreatingSession -> {
                // Show "Creating session..." progress
            }
            is DiditSdkState.Loading -> {
                // Show loading indicator
            }
            is DiditSdkState.Ready -> {
                // Verification UI is ready - launch it
                DiditSdk.launchVerificationUI(this@MainActivity)
            }
            is DiditSdkState.Error -> {
                // Show error message
                Log.e("Didit", "Error: ${state.message}")
            }
        }
    }
}

android.enableR8.fullMode=false

// Node.js / Express example. Run on your server. NEVER ship DIDIT_API_KEY to the device.
import express from "express";

const app = express();
app.use(express.json());

app.post("/api/verification/start", async (req, res) => {
  const response = await fetch("https://verification.didit.me/v3/session/", {
    method: "POST",
    headers: {
      "x-api-key": process.env.DIDIT_API_KEY!,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      workflow_id: process.env.DIDIT_WORKFLOW_ID,
      vendor_data: req.body.userId, // your stable user id
    }),
  });

  if (!response.ok) {
    return res.status(500).json({ error: `Didit ${response.status}` });
  }

  const { session_id, session_token } = await response.json();
  // Persist session_id <-> userId so you can match the webhook later.
  res.json({ session_id, session_token });
});

import android.app.Activity
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import me.didit.sdk.DiditSdk
import me.didit.sdk.VerificationResult
import me.didit.sdk.VerificationStatus
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.MediaType.Companion.toMediaType
import org.json.JSONObject

class VerificationFlow(private val activity: ComponentActivity) {
    private val http = OkHttpClient()
    private val json = "application/json".toMediaType()

    fun start(userId: String) {
        activity.lifecycleScope.launch {
            val token = withContext(Dispatchers.IO) {
                val body = JSONObject().put("userId", userId).toString().toRequestBody(json)
                val req = Request.Builder()
                    .url("https://your-backend.example.com/api/verification/start")
                    .post(body)
                    .build()
                http.newCall(req).execute().use { resp ->
                    JSONObject(resp.body!!.string()).getString("session_token")
                }
            }

            DiditSdk.startVerification(token = token) { result ->
                when (result) {
                    is VerificationResult.Completed -> when (result.session.status) {
                        VerificationStatus.APPROVED -> { /* optimistic UI; rely on webhook for source of truth */ }
                        VerificationStatus.PENDING  -> { /* show "under review" */ }
                        VerificationStatus.DECLINED -> { /* show retry/contact support */ }
                    }
                    is VerificationResult.Cancelled -> { /* user cancelled */ }
                    is VerificationResult.Failed    -> { /* show error: result.error.message */ }
                }
            }
        }
    }
}

app.post("/api/webhooks/didit", express.raw({ type: "application/json" }), (req, res) => {
  // 1. Verify the X-Signature header (see Webhooks docs)
  // 2. Parse the body
  const event = JSON.parse(req.body.toString());
  if (event.webhook_type === "status.updated") {
    // event.session_id, event.status ("Approved" | "Declined" | "In Review" | ...)
    // Look up the user by session_id and update their verification state.
  }
  res.sendStatus(200);
});

import android.os.Bundle
import android.util.Log
import androidx.activity.ComponentActivity
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.launch
import me.didit.sdk.Configuration
import me.didit.sdk.DiditSdk
import me.didit.sdk.DiditSdkState
import me.didit.sdk.VerificationResult
import me.didit.sdk.VerificationStatus
import me.didit.sdk.core.localization.SupportedLanguage

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // Observe SDK state
        lifecycleScope.launch {
            DiditSdk.state.collect { state ->
                when (state) {
                    is DiditSdkState.Ready -> DiditSdk.launchVerificationUI(this@MainActivity)
                    is DiditSdkState.Error -> Log.e("Didit", "Error: ${state.message}")
                    else -> { /* Idle, Loading, CreatingSession */ }
                }
            }
        }
    }

    fun startVerification() {
        val config = Configuration(
            languageLocale = SupportedLanguage.ENGLISH,
            loggingEnabled = true
        )

        // Method 1: UniLink (no backend required)
        DiditSdk.startVerification(
            workflowId = "your-workflow-id",
            vendorData = "user-123",
            configuration = config
        ) { result ->
            handleResult(result)
        }

        // Method 2: Backend Session (recommended for production)
        // DiditSdk.startVerification(
        //     token = "your-session-token",
        //     configuration = config
        // ) { result ->
        //     handleResult(result)
        // }
    }

    private fun handleResult(result: VerificationResult) {
        when (result) {
            is VerificationResult.Completed -> {
                when (result.session.status) {
                    VerificationStatus.APPROVED -> {
                        Log.d("Didit", "Approved! Session: ${result.session.sessionId}")
                    }
                    VerificationStatus.PENDING -> {
                        Log.d("Didit", "Under review")
                    }
                    VerificationStatus.DECLINED -> {
                        Log.d("Didit", "Declined")
                    }
                }
            }
            is VerificationResult.Cancelled -> {
                Log.d("Didit", "Cancelled: ${result.session?.sessionId ?: "unknown"}")
            }
            is VerificationResult.Failed -> {
                Log.e("Didit", "Error: ${result.error.message}")
            }
        }
    }
}