Meon DigiLocker SDK for Flutter

A Flutter package for integrating Meon DigiLocker APIs with dynamic form fields and validation. Includes searchable document dropdowns, complete document verification flow with WebView integration, and comprehensive error handling.

Features

• ✅ 6 Complete API integrations with DigiLocker services
• ✅ Dynamic form fields based on document selection
• ✅ Searchable document dropdown for easy issuer and document discovery
• ✅ Comprehensive validation for all inputs
• ✅ Complete document verification flow with WebView integration
• ✅ All API calls handled internally - no need to manage complex API sequences
• ✅ Dynamic client credentials support for different environments
• ✅ TypeScript-inspired Dart models with proper serialization
• ✅ Material Design 3 compatible widgets
• ✅ Error handling with descriptive messages
• ✅ Customizable theming and styling

Installation

Add this to your package's pubspec.yaml file:

dependencies:
  meon_digilocker_sdk: ^2.1.0

Or for local development:

dependencies:
  meon_digilocker_sdk:
    path: ../path/to/meon_digilocker_sdk

Then run:

flutter pub get

Platform Setup

Android

Add internet permission to android/app/src/main/AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <!-- ... other permissions ... -->
</manifest>

iOS

Add the following to ios/Runner/Info.plist:

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>
<key>io.flutter.embedded_views_preview</key>
<true/>

Quick Start

Simple Usage (Recommended)

The easiest way to use this SDK is with the DigilockerForm widget. All API calls and logic are handled internally:

import 'package:flutter/material.dart';
import 'package:meon_digilocker_sdk/meon_digilocker_sdk.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DigilockerForm(
        companyName: 'your-company-name',
        secretToken: 'your-secret-token',
        onSuccess: (data) {
          print('Document verification successful!');
          // Handle the verified document data here
          // data contains all the document information like:
          // - aadhar_no, pan_number, name, dob, etc.
        },
        onError: (error) {
          print('Error: $error');
          // Handle errors here
        },
      ),
    );
  }
}

That's it! The DigilockerForm component handles:

• Loading issuers
• Loading documents
• Loading form fields
• Form submission
• WebView handling
• Final data retrieval

Advanced Usage (SDK Methods)

If you need more control, you can use the SDK methods directly:

import 'package:meon_digilocker_sdk/meon_digilocker_sdk.dart';

// Initialize SDK with your credentials
final sdk = MeonDigilockerSDK(
  companyName: 'democapital',
  secretToken: 'cy7Kw2rWqdzVo2KPxlU0ymd9uRQKPSsb',
);

// Get access token
final tokenResponse = await sdk.getAccessToken();
print(tokenResponse.clientToken);

// Search for issuers
final issuersResponse = await sdk.getListOfIssuersInDetail(
  GetListOfIssuersInDetailParams(
    clientToken: tokenResponse.clientToken,
    state: tokenResponse.state,
    search: 'insurance',
  ),
);

// Generate DigiLocker URL
final urlResponse = await sdk.generateDigiUrl(
  GenerateDigiUrlParams(
    clientToken: tokenResponse.clientToken,
    redirectUrl: 'https://your-app.com/callback',
    companyName: 'your-company-name',
    otherDocuments: [
      {
        'doctype': 'PAN',
        'orgid': 'ORG001',
        'consent': 'Y',
        'pan_number': 'ABCDE1234F',
      }
    ],
  ),
);

// Get final verification data
final finalData = await sdk.sendEntireData(
  SendEntireDataParams(
    clientToken: tokenResponse.clientToken,
    state: tokenResponse.state,
    status: true,
  ),
);

Using Individual Components

You can also use the individual Flutter widgets:

import 'package:flutter/material.dart';
import 'package:meon_digilocker_sdk/meon_digilocker_sdk.dart';

class CustomDigilockerForm extends StatefulWidget {
  @override
  _CustomDigilockerFormState createState() => _CustomDigilockerFormState();
}

class _CustomDigilockerFormState extends State<CustomDigilockerForm> {
  final sdk = MeonDigilockerSDK(
    companyName: 'democapital',
    secretToken: 'cy7Kw2rWqdzVo2KPxlU0ymd9uRQKPSsb',
  );

  List<IssuerDetail> issuers = [];
  IssuerDetail? selectedIssuer;
  DocumentInfo? selectedDocument;
  List<DocumentField> fields = [];
  Map<String, String> fieldValues = {};

  @override
  void initState() {
    super.initState();
    _loadIssuers();
  }

  Future<void> _loadIssuers() async {
    try {
      final tokenResponse = await sdk.getAccessToken();
      final response = await sdk.getListOfIssuersInDetail(
        GetListOfIssuersInDetailParams(
          clientToken: tokenResponse.clientToken,
          state: tokenResponse.state,
          search: 'insurance',
        ),
      );
      setState(() {
        issuers = response.results;
      });
    } catch (e) {
      print('Error loading issuers: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Custom DigiLocker Form')),
      body: Padding(
        padding: EdgeInsets.all(16),
        child: Column(
          children: [
            // Issuer Selection
            if (issuers.isNotEmpty)
              DropdownButtonFormField<IssuerDetail>(
                value: selectedIssuer,
                hint: Text('Select Issuer'),
                items: issuers.map((issuer) {
                  return DropdownMenuItem(
                    value: issuer,
                    child: Text(issuer.name),
                  );
                }).toList(),
                onChanged: (issuer) {
                  setState(() {
                    selectedIssuer = issuer;
                    selectedDocument = null;
                    fields = [];
                    fieldValues = {};
                  });
                },
              ),

            // Document Selection
            if (selectedIssuer != null)
              DocumentDropdown(
                documents: selectedIssuer!.documentsInfo,
                onSelect: (document) {
                  setState(() {
                    selectedDocument = document;
                    fields = document!.requiredParameters;
                    fieldValues = {};
                  });
                  // Initialize field values
                  document!.requiredParameters.forEach((field) {
                    fieldValues[field.paramname] = '';
                  });
                },
                placeholder: 'Select a document...',
              ),

            // Dynamic Form Fields
            if (selectedDocument != null && fields.isNotEmpty)
              DynamicFormFields(
                fields: fields,
                values: fieldValues,
                onChanged: (values) {
                  setState(() {
                    fieldValues = values;
                  });
                },
              ),

            // Submit Button
            if (selectedDocument != null && fields.isNotEmpty)
              ElevatedButton(
                onPressed: () async {
                  // Handle form submission
                  print('Submitting with values: $fieldValues');
                },
                child: Text('Submit & Verify'),
              ),
          ],
        ),
      ),
    );
  }
}

API Reference

MeonDigilockerSDK

Main SDK class for Meon DigiLocker integration.

Constructor

MeonDigilockerSDK({
  required String companyName,
  required String secretToken,
  Duration timeout = const Duration(seconds: 30),
});

• companyName (required): Your company name
• secretToken (required): Your secret token
• timeout: Request timeout duration (default: 30 seconds)

Methods

getAccessToken()

Get access token and state for authentication.

GetAccessTokenResponse response = await sdk.getAccessToken();
// Returns: { clientToken, state, status }

getListOfIssuersInDetail(params)

Search for available document issuers.

GetListOfIssuersInDetailResponse response = await sdk.getListOfIssuersInDetail(
  GetListOfIssuersInDetailParams(
    clientToken: 'token',
    state: 'state',
    search: 'insurance',
    page: 1,
  ),
);

generateDigiUrl(params)

Create URL for DigiLocker document verification flow.

GenerateDigiUrlResponse response = await sdk.generateDigiUrl(
  GenerateDigiUrlParams(
    clientToken: 'token',
    redirectUrl: 'https://your-app.com/callback',
    companyName: 'company',
    otherDocuments: [...],
  ),
);

sendEntireData(params)

Retrieve final document data after verification.

SendEntireDataResponse response = await sdk.sendEntireData(
  SendEntireDataParams(
    clientToken: 'token',
    state: 'state',
    status: true,
  ),
);

Flutter Widgets

DigilockerForm

Complete form component that handles the entire document verification flow.

Props:

• companyName (required): Your company name
• secretToken (required): Your secret token
• redirectUrl: Redirect URL after verification
• onSuccess: Callback when verification succeeds
• onError: Callback when an error occurs
• primaryColor: Primary color for theming
• backgroundColor: Background color
• loadingColor: Loading indicator color

DocumentDropdown

Searchable dropdown for selecting documents.

Props:

• documents (required): List of documents to display
• onSelect: Callback when document is selected
• placeholder: Placeholder text
• disabled: Whether the dropdown is disabled
• primaryColor: Primary color for theming

DynamicFormFields

Dynamic form fields based on document selection.

Props:

• fields (required): List of field definitions
• values (required): Current field values
• onChanged (required): Callback when values change
• showLabels: Whether to show field labels (default: true)
• primaryColor: Primary color for theming

Data Models

DocumentField

Represents a form field for document input.

DocumentInfo

Contains document information including required parameters.

IssuerDetail

Contains issuer information and available documents.

SendEntireDataResponse

Contains the final verification data including Aadhaar, PAN, and other document details.

Validation

The SDK includes comprehensive validation:

• Company name and secret token validation
• Client token and state validation
• Document field validation
• API response validation

All methods throw descriptive Exception objects if validation fails.

Error Handling

All API methods throw exceptions that can be caught:

try {
  final response = await sdk.getAccessToken();
} catch (e) {
  print('Error: $e');
  // Handle the error appropriately
}

Example App

Check out the example/ directory for a complete Flutter app demonstrating all features of the SDK.

Run the example:

cd example
flutter run

License

MIT License - see LICENSE file for details.

Support

For issues and questions, please contact support or create an issue on GitHub.

Libraries

meon_digilocker_sdk

Meon DigiLocker SDK for Flutter

models/models

services/meon_digilocker_sdk

widgets/digilocker_form

widgets/document_dropdown

widgets/dynamic_form_fields