Flutter SDK Setup

allprojects { 
   repositories { 
      google() 
      maven { 
         url "https://phonepe.mycloudrepo.io/public/repositories/phonepe-intentsdk-android" 
      } 
   } 
}

import io.flutter.embedding.android.FlutterFragmentActivity
class MainActivity : FlutterFragmentActivity()

<key>LSApplicationQueriesSchemes</key> 
<array> 
   <string>ppemerchantsdkv1</string>  
   <string>ppemerchantsdkv2</string> 
   <string>ppemerchantsdkv3</string>
   <string>paytmmp</string>
   <string>gpay</string> 
</array>

cd ios 
pod install

- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options 
{ 
  NSMutableDictionary *userInfo = [[NSMutableDictionary alloc] init]; 
  [userInfo setObject:options forKey:@"options"];    
  [userInfo setObject:url forKey:@"openUrl"]; 
  [[NSNotificationCenter defaultCenter] postNotificationName: @"ApplicationOpenURLNotification" object:nil userInfo:userInfo]; 
  return YES; 
}

flutter pub add phonepe_payment_sdk

flutter pub get

import 'package:phonepe_payment_sdk/phonepe_payment_sdk.dart';

/*
  * This method is used to initiate PhonePe Payment sdk.
  * Provide all the information as requested by the method signature.
  * Params:
  *    - environment: This signified the environment required for the payment sdk
  *      possible values: SANDBOX, PRODUCTION
  *      if any unknown value is provided, PRODUCTION will be considered as default.
  *    - merchantId: The merchant id provided by PhonePe at the time of onboarding.
  *    - flowId : An alphanumeric string without any special character. It acts as a common ID b/w
  *      your app user journey and PhonePe SDK. This helps to debug prod issue. 
  *      Recommended - Pass user-specific information or merchant user-id to track the journey.
  *    - enableLogging: If you want to enable / visualize sdk log @IOS
  *        - enable = YES
  *        - disable = NO
  */
static Future<bool> init(String environment, String merchantId,
  String flowId, bool enableLogging) async {
    bool result = await _channel.invokeMethod('init', {
      'environment': environment,
      'merchantId': merchantId,
      'flowId': flowId,
      'enableLogs': enableLogging,
    });
    return result;
  }

Example:

PhonePePaymentSdk.init(environmentValue, merchantId, flowId, enableLogs)
  .then((isInitialized) => {
    setState(() {
      result = 'PhonePe SDK Initialized - $isInitialized';
    })
  })
  .catchError((error) {
    handleError(error);
    return <dynamic > {};
  });

/*
  * This method is used to initiate PhonePe Transaction Flow.
  * Provide all the information as requested by the method signature.
  * Params:
  *    - request : The request body for the transaction as per the developer docs.
  *    - appSchema: @Optional(Not need for Android) For iOS, Your custom URL Schemes, as per the developer docs.
  *
  * Return: Will be returning a dictionary / hashMap
  *  {
  *     status: String, // string value to provide the status of the transaction
  *                     // possible values: SUCCESS, FAILURE, INTERRUPTED
  *     error: String   // if any error occurs
  *  }
  */
  static Future<Map<dynamic, dynamic>?> startTransaction(String request,
    String appSchema) async {
      var dict = <String, dynamic>{'request': request, 'appSchema': appSchema};
      Map<dynamic, dynamic>? result =
        await _channel.invokeMethod('startTransaction', dict);

      return result;
    }

Example:

PhonePePaymentSdk.startTransaction(request, appSchema)
  .then((response) => {
    setState(() {
      if (response != null) {
        String status = response['status'].toString();
        String error = response['error'].toString();
        if (status == 'SUCCESS') {
          result = "Flow Completed - Status: Success!";
        } else {
          result =
            "Flow Completed - Status: $status and Error: $error";
        }
      } else {
          result = "Flow Incomplete";
      }
    })
  })
  .catchError((error) {
    handleError(error);
    return <dynamic > {};
  });

//Sample Request:
Map<String, dynamic> payload = {
  "orderId": orderId,
  "merchantId": merchantId,
  "token": token,
  "paymentMode": {"type": "PAY_PAGE"}
};
String request = jsonEncode(payload);
print("Payment Request: $request");