Khalti Payment Gateway

https://docs.khalti.com
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Khalti Payment Gateway (KPG) is a comprehensive payment solution and digital wallet for online...
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### Install and Serve Khalti Docs Locally

Source: https://docs.khalti.com/contribution

Steps to install the necessary tools (mkdocs and mkdocs-material) and serve the documentation site locally for previewing changes.

```bash
pip install mkdocs-material

mkdocs serve
```

--------------------------------

### Khalti E-payment Initiation Examples

Source: https://docs.khalti.com/khalti-epayment

Code examples demonstrating how to initiate an e-payment with Khalti using different programming languages and tools.

```curl
curl --location 'https://dev.khalti.com/api/v2/epayment/initiate/' \
--header 'Authorization: key 05bf95cc57244045b8df5fad06748dab' \
--header 'Content-Type: application/json' \
--data-raw '{
  "return_url": "http://example.com/",
  "website_url": "http://example.com/",
  "amount": "1000",
  "purchase_order_id": "Ordwer01",
  "purchase_order_name": "Test",
  "customer_info": {
    "name": "Test Bahadur",
    "email": "test@khalti.com",
    "phone": "9800000001"
  }
}'
```

```php
<?php
    $curl = curl_init();
    curl_setopt_array($curl, array(
    CURLOPT_URL => 'https://dev.khalti.com/api/v2/epayment/initiate/',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 0,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_POSTFIELDS =>'{ 
    "return_url": "http://example.com/",
    "website_url": "https://example.com/",
    "amount": "1000",
    "purchase_order_id": "Order01",
        "purchase_order_name": "test",

    "customer_info": {
        "name": "Test Bahadur",
        "email": "test@khalti.com",
        "phone": "9800000001"
    }
    }

    ',
    CURLOPT_HTTPHEADER => array(
        'Authorization: key live_secret_key_68791341fdd94846a146f0457ff7b455',
        'Content-Type: application/json',
    ),
    ));

    $response = curl_exec($curl);

    curl_close($curl);
    echo $response;

?>
```

```python
import requests
import json

url = "https://dev.khalti.com/api/v2/epayment/initiate/"

payload = json.dumps({
    "return_url": "http://example.com/",
    "website_url": "https://example.com/",
    "amount": "1000",
    "purchase_order_id": "Order01",
    "purchase_order_name": "test",
    "customer_info": {
    "name": "Ram Bahadur",
    "email": "test@khalti.com",
    "phone": "9800000001"
    }
})
headers = {
    'Authorization': 'key live_secret_key_68791341fdd94846a146f0457ff7b455',
    'Content-Type': 'application/json',
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)
```

```csharp
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
namespace KhaltiApiExample
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var url = "https://dev.khalti.com/api/v2/epayment/initiate/";

            var payload = new
            {
                return_url = "http://example.com/",
                website_url = "https://example.com/",
                amount = "1000",
                purchase_order_id = "Order01",
                purchase_order_name = "test",
                customer_info = new
                {
                    name = "Ram Bahadur",
                    email = "test@khalti.com",
                    phone = "9800000001"
                }
            };

            var jsonPayload = JsonConvert.SerializeObject(payload);
            var content = new StringContent(jsonPayload, Encoding.UTF8, "application/json");

            var client = new HttpClient();
            client.DefaultRequestHeaders.Add("Authorization", "key live_secret_key_68791341fdd94846a146f0457ff7b455");

            var response = await client.PostAsync(url, content);
            var responseContent = await response.Content.ReadAsStringAsync();

            Console.WriteLine(responseContent);
        }
    }
}
```

```javascript
var request = require('request');
var options = {
    'method': 'POST',
    'url': 'https://dev.khalti.com/api/v2/epayment/initiate/',
    'headers': {
    'Authorization': 'key live_secret_key_68791341fdd94846a146f0457ff7b455',
    'Content-Type': 'application/json',
    },
    body: JSON.stringify({
    "return_url": "http://example.com/",
    "website_url": "https://example.com/",
    "amount": "1000",
    "purchase_order_id": "Order01",
    "purchase_order_name": "test",
    "customer_info": {
        "name": "Ram Bahadur",
        "email": "test@khalti.com",
        "phone": "9800000001"
    }
    })
};
request(options, function (error, response) {
    if (error) throw new Error(error);
    console.log(response.body);
});
```

--------------------------------

### Clone Khalti Docs Repository

Source: https://docs.khalti.com/contribution

Instructions for forking and cloning the Khalti documentation repository to your local development machine.

```bash
git clone git@github.com:<YOUR_USERNAME>/khalti-docs-official-repo.git
```

--------------------------------

### Khalti Transaction Callback Examples

Source: https://docs.khalti.com/checkout/diy-banking

Provides example URLs for receiving transaction status updates via callbacks. Includes examples for both successful and canceled transactions.

```text
http://example.com/?pidx=bZQLD9wRVWo4CdESSfuSsB
&txnId=4H7AhoXDJWg5WjrcPT9ixW
&amount=10000
&total_amount=10000
&status=Completed
&mobile=98XXXXX904
&tidx=4H7AhoXDJWg5WjrcPT9ixW
&purchase_order_id=test12
&purchase_order_name=test
&transaction_id=4H7AhoXDJWg5WjrcPT9ixW
```

```text
http://example.com/?pidx=bZQLD9wRVWo4CdESSfuSsB
&transaction_id=
&tidx=
&amount=10000
&total_amount=10000
&mobile=
&status=User canceled
&purchase_order_id=test12
&purchase_order_name=test
```

--------------------------------

### Khalti Flutter SDK Setup and Initialization

Source: https://docs.khalti.com/checkout/flutter/khalti-checkout

Details on setting up the Khalti Flutter SDK and initializing the payment gateway. This includes obtaining merchant credentials for sandbox and production environments.

```dart
/*
  To integrate Khalti Payment Gateway, a merchant account is required.
  You can create one from: https://khalti.com/join/merchant/#/

  For Sandbox Access:
  Signup from: https://test-admin.khalti.com/#/join/merchant
  Use 987654 as login OTP for sandbox env.

  For Production Access:
  Visit: https://admin.khalti.com

  Test Credentials for sandbox environment:
  Test Khalti IDs:
  9800000000
  9800000001
  9800000002
  9800000003
  9800000004
  9800000005

  Test MPIN: 1111
  Test OTP: 987654
*/

// Example of initializing Khalti in your Flutter app (conceptual):
// import 'package:khalti_checkout_flutter/khalti_checkout_flutter.dart';
//
// void initializeKhalti() {
//   KhaltiCheckoutFlutter.init(
//     // Use your Khalti public key here
//     publicKey: "YOUR_KHALTI_PUBLIC_KEY",
//     // Set to true for sandbox, false for production
//     isSandbox: true,
//   );
// }
```

--------------------------------

### Install Khalti iOS SDK via CocoaPods

Source: https://docs.khalti.com/checkout/ios

Instructions to install the Khalti SDK using CocoaPods by adding the dependency to your Podfile. This is the standard method for integrating the SDK into an iOS project.

```ruby
pod 'KhaltiCheckout'
```

--------------------------------

### Push Changes to Forked Repository

Source: https://docs.khalti.com/contribution

Commands to push your local changes to your forked repository on GitHub, preparing for a pull request.

```bash
git push origin master
```

--------------------------------

### Initialize Khalti SDK without onReturn Callback

Source: https://docs.khalti.com/checkout/ios

Shows how to initialize the Khalti SDK without the optional `onReturn` callback. This setup includes configuration, payment result, and message callbacks.

```Swift
khalti = Khalti.init(config: KhaltiPayConfig(publicKey:"4aa1b684f4de4860968552558fc8487d", pIdx:"8mBsbuzGYDWveAZkMn4Q2F",environment:Environment.TEST), onPaymentResult: {[weak self] (paymentResult,khalti) in
        print("Demo | onPaymentResult", paymentResult)

}, onMessage: {[weak self](onMessageResult,khalti) in

        //Handle onMessage callback here
        //if needsPaymentConfiramtion true then verify payment status

        let shouldVerify = onMessageResult.needsPaymentConfirmation

        if shouldVerify {
         khalti?.verify()
        }else{
         khalti?.close()
        }

})
```

--------------------------------

### Khalti Transaction Initiated Response

Source: https://docs.khalti.com/khalti-epayment

Example JSON response for a Khalti transaction that is in an 'Initiated' state. This signifies the transaction has started processing.

```json
{
   "pidx": "HT6o6PEZRWFJ5ygavzHWd5",
   "total_amount": 1000,
   "status": "Initiated",
   "transaction_id": null,
   "fee": 0,
   "refunded": false
}
```

--------------------------------

### Initiate Khalti Payment Request (JavaScript)

Source: https://docs.khalti.com/khalti-epayment

Example of initiating a Khalti payment request using a JavaScript client. It demonstrates setting up request options including customer information and making a POST request.

```JavaScript
const options = {
    url: "https://khalti.com/api/v1/payment/initiate/",
    method: "POST",
    headers: {
        "Content-Type": "application/json"
    },
    body: JSON.stringify({
        "return_url": "http://localhost:3000/",
        "website_url": "http://localhost:3000/",
        "amount": 1000,
        "purchase_order_id": "Order01",
        "purchase_order_name": "test",
        "customer_info": {
            "name": "Ram Bahadur",
            "email": "test@khalti.com",
            "phone": "9800000001"
        }
    })
};

request(options, function (error, response) {
    if (error) throw new Error(error);
    console.log(response.body);
});
```

--------------------------------

### Khalti Payment Callback Request Examples

Source: https://docs.khalti.com/khalti-epayment

Sample callback requests received at the merchant's return URL for both successful and canceled Khalti transactions.

```APIDOC
Success transaction callback:
http://example.com/?pidx=bZQLD9wRVWo4CdESSfuSsB
&txnId=4H7AhoXDJWg5WjrcPT9ixW
&amount=1000
&total_amount=1000
&status=Completed
&mobile=98XXXXX904
&tidx=4H7AhoXDJWg5WjrcPT9ixW
&purchase_order_id=test12
&purchase_order_name=test
&transaction_id=4H7AhoXDJWg5WjrcPT9ixW

Canceled transaction callback:
http://example.com/?pidx=bZQLD9wRVWo4CdESSfuSsB
&transaction_id=
&tidx=
&amount=1000
&total_amount=1000
&mobile=
&status=User canceled
&purchase_order_id=test12
&purchase_order_name=test
```

--------------------------------

### Get Bank List API

Source: https://docs.khalti.com/checkout/diy-banking

Retrieves a list of banks supported by Khalti for e-banking and mobile checkout. This GET request does not require authorization and returns bank details including names, logos, and supported payment types.

```APIDOC
Get Bank List:
  Endpoint:
    - ebanking URL: https://khalti.com/api/v5/bank/?payment_type=ebanking
    - Mbanking URL: https://khalti.com/api/v5/bank/?payment_type=mobilecheckout
  Method: GET
  Authorization: Not Required
  Response:
    - total_pages: Integer, total number of pages for bank records.
    - total_records: Integer, total number of banks available.
    - next: String or null, URL for the next page of results.
    - previous: String or null, URL for the previous page of results.
    - record_range: Array of integers, start and end index of records on the current page.
    - current_page: Integer, the current page number.
    - records: Array of Bank Objects.
      - idx: String, unique identifier for the bank.
      - name: String, full name of the bank.
      - short_name: String, short name or acronym of the bank.
      - logo: String, URL to the bank's logo.
      - swift_code: String, SWIFT code of the bank.
      - has_cardpayment: Boolean, indicates if card payments are supported.
      - address: String, address of the bank's headquarters.
      - ebanking_url: String, URL for e-banking services (if applicable).
      - has_ebanking: Boolean, indicates if e-banking is supported.
      - has_mobile_checkout: Boolean, indicates if mobile checkout is supported.
      - has_direct_withdraw: Boolean, indicates if direct withdrawal is supported.
      - has_nchl: Boolean, indicates if NCHL integration is supported.
      - has_mobile_banking: Boolean, indicates if mobile banking is supported.
      - play_store: String, URL to the bank's Android app on Play Store.
      - app_store: String, URL to the bank's iOS app on App Store.
      - branches: Array, list of bank branches (details not specified in example).
```

```json
{
  "total_pages": 1,
  "total_records": 14,
  "next": null,
  "previous": null,
  "record_range": [
    1,
    14
  ],
  "current_page": 1,
  "records": [
    {
      "idx": "UZmPqTDkdhKmukdZe2gVWZ",
      "name": "Agricultural Development Bank Limited",
      "short_name": "ADBL",
      "logo": "https://khalti-static.s3.ap-south-1.amazonaws.com/media/bank-logo/adbl.png",
      "swift_code": "ADBLNPKA",
      "has_cardpayment": false,
      "address": "Singhadurbar, Kathmandu",
      "ebanking_url": "",
      "has_ebanking": true,
      "has_mobile_checkout": true,
      "has_direct_withdraw": true,
      "has_nchl": false,
      "has_mobile_banking": false,
      "play_store": "",
      "app_store": "",
      "branches": []
    }
  ]
}
```

--------------------------------

### Khalti Payment Success Callback Parameters

Source: https://docs.khalti.com/checkout/diy-banking

Details the parameters provided to the merchant's return URL after a user completes a Khalti payment. The callback URL must support GET requests and includes transaction status and identifiers for confirmation.

```APIDOC
Payment Success Callback:
  Method: GET
  Parameters:
    - pidx: The initial payment identifier.
    - status: Status of the transaction (e.g., 'Completed', 'Pending', 'User canceled').
    - transaction_id: The transaction identifier at Khalti.
    - tidx: Same value as transaction_id.
    - amount: Amount paid in paisa.
    - mobile: Payer's Khalti ID.
    - purchase_order_id: The initial purchase_order_id provided during payment initiation.
    - purchase_order_name: The initial purchase_order_name provided during payment initiation.
    - total_amount: Same value as amount.

  Note: Merchants are recommended to use the payment lookup API for final confirmation and can implement their own validation steps.
```

--------------------------------

### Khalti Payment Lookup API

Source: https://docs.khalti.com/checkout/diy-banking

API endpoint for verifying transaction status using a payment ID (pidx). It details the request method, URL, authorization requirements, and provides comprehensive examples of request and response payloads for various transaction statuses.

```APIDOC
POST /epayment/lookup/

Authorization: Required
Format: application/json

Request Data:
{
  "pidx": "HT6o6PEZRWFJ5ygavzHWd5"
}

Response Data Examples:

Success Response:
{
  "pidx": "HT6o6PEZRWFJ5ygavzHWd5",
  "total_amount": 10000,
  "status": "Completed",
  "transaction_id": "GFq9PFS7b2iYvL8Lir9oXe",
  "fee": 0,
  "refunded": false
}

Pending Response:
{
  "pidx": "HT6o6PEZRWFJ5ygavzHWd5",
  "total_amount": 10000,
  "status": "Pending",
  "transaction_id": null,
  "fee": 0,
  "refunded": false
}

Initiated Response:
{
  "pidx": "HT6o6PEZRWFJ5ygavzHWd5",
  "total_amount": 10000,
  "status": "Initiated",
  "transaction_id": null,
  "fee": 0,
  "refunded": false
}

Refunded Response:
{
  "pidx": "HT6o6PEZRWFJ5ygavzHWd5",
  "total_amount": 10000,
  "status": "Refunded",
  "transaction_id": "GFq9PFS7b2iYvL8Lir9oXe",
  "fee": 0,
  "refunded": true
}

Expired Response:
{
  "pidx": "H889Er9gq4j92oCrePrDwf",
  "total_amount": 10000,
  "status": "Expired",
  "transaction_id": null,
  "fee": 0,
  "refunded": false
}

Canceled Response:
{
  "pidx": "vNTeXkSEaEXK2J4i7cQU6e",
  "total_amount": 10000,
  "status": "User canceled",
  "transaction_id": null,
  "fee": 0,
  "refunded": false
}

Lookup Payload Details:
- pidx: The payment id of the transaction.
- total_amount: The total amount of the transaction.
- status: Transaction status ('Completed', 'Pending', 'Refunded', 'Expired', 'User canceled', 'Partially refunded').
- transaction_id: The unique identifier for the transaction.
- fee: The fee set for the merchant.
- refunded: Boolean indicating if the transaction has been refunded.

Lookup Status Interpretation:
- Completed: Provide service to user.
- Pending: Hold service, contact Khalti team.
- Refunded: Transaction refunded, do not provide service.
- Expired: Payment not made, do not provide service.
- User canceled: Transaction canceled, do not provide service.

Important Note: Only 'Completed' status signifies a successful transaction. 'Canceled', 'Expired', 'Failed' statuses must be treated as failed. Khalti is not accountable for losses due to incomplete integration or providing service without checking lookup status.

Generic Error Example (Incorrect Authorization):
{
  "detail": "Invalid token.",
  "status_code": 401
}
```

--------------------------------

### Khalti E-payment Initiation API Endpoint

Source: https://docs.khalti.com/khalti-epayment

Details for the Khalti API endpoint used to initiate an e-payment. Includes the HTTP method, URL, required headers, and the structure of the request payload. Additional attributes starting with 'merchant_' can be passed for meta-data.

```APIDOC
POST https://dev.khalti.com/api/v2/epayment/initiate/

Headers:
  Authorization: key YOUR_MERCHANT_KEY
  Content-Type: application/json

Request Body:
{
  "return_url": "string",
  "website_url": "string",
  "amount": "string",
  "purchase_order_id": "string",
  "purchase_order_name": "string",
  "customer_info": {
    "name": "string",
    "email": "string",
    "phone": "string"
  },
  "amount_breakdown": [
    {
      "label": "string",
      "amount": "integer"
    }
  ],
  "product_details": [
    {
      "identity": "string",
      "name": "string",
      "total_price": "integer",
      "quantity": "integer",
      "unit_price": "integer"
    }
  ],
  "merchant_username": "string",
  "merchant_extra": "string"
}

Note: Attributes starting with 'merchant_' are optional and used for passing additional meta-data, which will be returned in the success response payload.
```

--------------------------------

### Initialize Khalti SDK with onReturn Callback

Source: https://docs.khalti.com/checkout/ios

Demonstrates initializing the Khalti SDK with configuration, payment result, message, and optional return callbacks. The `onReturn` callback is invoked when the return URL page is successfully loaded.

```Swift
Khalti.init(config: KhaltiPayConfig(publicKey:"4aa1b684f4de4860968552558fc8487d", pIdx:"8mBsbuzGYDWveAZkMn4Q2F",environment:Environment.TEST),
onPaymentResult: {[weak self] (paymentResult,khalti) in

}, onMessage: {[weak self](onMessageResult,khalti) in

}, onReturn: {(khalti) in
 // called when payment is success
})
```

--------------------------------

### Initialize Khalti SDK with Callbacks

Source: https://docs.khalti.com/checkout/android

Initialize the Khalti SDK with the `KhaltiPayConfig` and define callbacks for handling payment results, messages, and return URLs. The context must be able to open an activity.

```kotlin
Khalti.init(
    LocalContext.current,  // context
    config,
    onPaymentResult = { paymentResult, khalti ->
         // your implementation here
    },
    onMessage = { payload, khalti ->
         // your implementation here
    },
    onReturn = { khalti ->
         // your implementation here
    }
)
```

--------------------------------

### Initialize Khalti SDK with onReturn Callback (Kotlin)

Source: https://docs.khalti.com/checkout/android

Demonstrates how to initialize the Khalti SDK in an Android application, including the `onReturn` callback for handling return events. This method requires the application context, KhaltiPayConfig with public key and environment, and callback functions for payment results, messages, and return events.

```kotlin
val khalti = Khalti.init(
    LocalContext.current,
    KhaltiPayConfig(
        publicKey = "<public_key>",
        pidx = "<pidx>",
        environment = Environment.TEST // Or Environment.Prod for production
    ),
    onPaymentResult = { paymentResult, khalti ->
        // Your implementation
    },
    onMessage = { payload, khalti ->
        // Your implementation
    },
    onReturn = { khalti ->
        // Your implementation
    }
)
```

--------------------------------

### Initialize KhaltiPayConfig

Source: https://docs.khalti.com/checkout/android

Create an instance of `KhaltiPayConfig` to configure the Khalti payment process. It requires your public key, a payment request ID (pidx), a return URL, and the environment (TEST or PROD).

```kotlin
val config = KhaltiPayConfig(
    publicKey = "<your_public_key>",
    pidx = "<your_pidx>",
    environment = Environment.TEST
)
```

--------------------------------

### Khalti Transaction Refunded Response

Source: https://docs.khalti.com/khalti-epayment

Example JSON response for a Khalti transaction that has been 'Refunded'. This includes the transaction ID and indicates the refund status.

```json
{
   "pidx": "HT6o6PEZRWFJ5ygavzHWd5",
   "total_amount": 1000,
   "status": "Refunded",
   "transaction_id": "GFq9PFS7b2iYvL8Lir9oXe",
   "fee": 0,
   "refunded": true
}
```

--------------------------------

### Khalti Transaction Canceled Response

Source: https://docs.khalti.com/khalti-epayment

Example JSON response for a Khalti transaction that was 'User canceled'. This indicates the user actively cancelled the payment process.

```json
{
   "pidx": "vNTeXkSEaEXK2J4i7cQU6e",
   "total_amount": 1000,
   "status": "User canceled",
   "transaction_id": null,
   "fee": 0,
   "refunded": false
}
```

--------------------------------

### Khalti init() Method Arguments

Source: https://docs.khalti.com/checkout/flutter/khalti-checkout

Explains the arguments for the Khalti.init() static method, including debugging flags, payment configuration, and various callback functions for handling payment events.

```APIDOC
Khalti.init(
  enableDebugging: bool,
  payConfig: KhaltiPayConfig,
  onPaymentResult: (PaymentResult, Khalti) -> void,
  onMessage: (Khalti, {description: str, statusCode: int, event: KhaltiEvent, needsPaymentConfirmation: bool}) -> Future<void>,
  onReturn: () -> void
)

Arguments:
  enableDebugging: A boolean argument that when set to true can be used to view network logs in the debug console. Defaults to false.
  payConfig: An instance of KhaltiPayConfig() used to set payment configuration data.
  onPaymentResult: A callback function triggered after a successful payment and redirection to the merchant's return URL. Receives PaymentResult and Khalti instances.
  onMessage: A callback function triggered to convey any message or error information. Provides description, status code, event, and needsPaymentConfirmation flag. The Khalti instance is also provided.
  onReturn: A callback function that gets triggered when the return_url is successfully loaded.

Breaking Change (v1.0.0-dev.5+):
  Developers no longer need to manually add 'return_url' within KhaltiPayConfig; the SDK handles it automatically.

```

--------------------------------

### Khalti Transaction Pending Response

Source: https://docs.khalti.com/khalti-epayment

Example JSON response for a Khalti transaction that is in a 'Pending' state. This indicates the transaction has been initiated but not yet completed or failed.

```json
{
   "pidx": "HT6o6PEZRWFJ5ygavzHWd5",
   "total_amount": 1000,
   "status": "Pending",
   "transaction_id": null,
   "fee": 0,
   "refunded": false
}
```

--------------------------------

### Initialize Khalti SDK in Flutter

Source: https://docs.khalti.com/checkout/flutter/khalti-checkout

Demonstrates the initialization of the Khalti SDK within a Flutter StatefulWidget's initState method. Includes setting up payment configuration and defining callback functions for payment results and messages.

```dart
class KhaltiSDKDemo extends StatefulWidget {
  const KhaltiSDKDemo({super.key});

  @override
  State<KhaltiSDKDemo> createState() => _KhaltiSDKDemoState();
}

class _KhaltiSDKDemoState extends State<KhaltiSDKDemo> {
  late final Future<Khalti> khalti;

  @override
  void initState() {
    super.initState();
    final payConfig = KhaltiPayConfig(
      publicKey: '__live_public_key__', // Merchant's public key
      pidx: pidx, // This should be generated via a server side POST request.
      environment: Environment.prod,
    );

    khalti = Khalti.init(
      enableDebugging: true,
      payConfig: payConfig,
      onPaymentResult: (paymentResult, khalti) {
        log(paymentResult.toString());
      },
      onMessage: (
        khalti, {
        description,
        statusCode,
        event,
        needsPaymentConfirmation,
      }) async {
        log(
          'Description: $description, Status Code: $statusCode, Event: $event, NeedsPaymentConfirmation: $needsPaymentConfirmation',
        );
      },
      onReturn: () => log('Successfully redirected to return_url.'),
    );
  }

  @override
  Widget build(BuildContext context) {
    // Rest of the code
    return Container(); // Placeholder
  }
}

```

--------------------------------

### Khalti Transaction Expired Response

Source: https://docs.khalti.com/khalti-epayment

Example JSON response for a Khalti transaction that has 'Expired'. This means the payment link or transaction window has passed without completion.

```json
{
   "pidx": "H889Er9gq4j92oCrePrDwf",
   "total_amount": 1000,
   "status": "Expired",
   "transaction_id": null,
   "fee": 0,
   "refunded": false
}
```

--------------------------------

### Initialize Khalti SDK without onReturn Callback (Kotlin)

Source: https://docs.khalti.com/checkout/android

Shows the initialization of the Khalti SDK without the `onReturn` callback. This configuration is suitable when specific handling for return events is not required. It still necessitates the application context, KhaltiPayConfig, and a callback for payment results and messages.

```kotlin
val khalti = Khalti.init(
    LocalContext.current,
    KhaltiPayConfig(
        publicKey = "<public_key>",
        pidx = "<pidx>",
        environment = Environment.TEST // Or Environment.Prod for production
    ),
    onPaymentResult = { paymentResult, khalti ->
        // Your implementation
    },
    onMessage = { payload, khalti ->
        // Your implementation
    }
)
```

--------------------------------

### KhaltiPayConfig Parameters

Source: https://docs.khalti.com/checkout/flutter/khalti-checkout

Details the parameters required for configuring KhaltiPayConfig, including public key, product identifier (pidx), and environment settings for test or production APIs.

```APIDOC
KhaltiPayConfig:
  __init__(publicKey: str, pidx: str, environment: Environment = Environment.prod)
    publicKey: Merchant's live or test public key provided by Khalti.
    pidx: Unique product identifier received after initiating the payment via a server-side POST request.
    environment: An enum that determines whether test API or production API should be invoked. Can be either Environment.prod or Environment.test. Defaults to Environment.prod.

Example:
  final payConfig = KhaltiPayConfig(
    publicKey: '__live_public_key__',
    pidx: pidx,
    environment: Environment.prod,
  );

```

--------------------------------

### Khalti Initiate Payment API

Source: https://docs.khalti.com/checkout/diy-banking

Initiates a payment request to Khalti. This is a server-side POST request that returns a unique payment identifier (pidx) and a payment URL for redirection. It requires authorization and specifies details like amount, return URL, and customer information.

```APIDOC
Endpoint:
  URL: https://khalti.com/api/v2/epayment/initiate/
  Method: POST
  Authorization: Required

Request Payload:
  {
    "return_url": "string",
    "website_url": "string",
    "amount": "string",
    "ttl": "integer",
    "bank": "string",
    "modes": ["string"],
    "purchase_order_id": "string",
    "purchase_order_name": "string",
    "customer_info": {
      "name": "string",
      "email": "string",
      "phone": "string"
    },
    "amount_breakdown": [
      {
        "label": "string",
        "amount": "integer"
      }
    ],
    "product_details": [
      {
        "identity": "string",
        "name": "string",
        "total_price": "integer",
        "quantity": "integer",
        "unit_price": "integer"
      }
    ]
  }

Success Response:
  {
    "pidx": "string",
    "payment_url": "string",
    "expires_at": "string",
    "expires_in": "integer"
  }

Error Responses:
  - return_url is blank:
    {
      "return_url": ["This field may not be blank."],
      "error_key": "validation_error"
    }
  - return_url is invalid:
    {
      "return_url": ["Enter a valid URL."],
      "error_key": "validation_error"
    }
  - website_url is blank:
    {
      "website_url": ["This field may not be blank."],
      "error_key": "validation_error"
    }
  - website_url is invalid:
    {
      "website_url": ["Enter a valid URL."],
      "error_key": "validation_error"
    }
  - Amount is less than 10:
    {
      "amount": ["Amount should be greater than Rs. 100, that is 10000 paisa."],
      "error_key": "validation_error"
    }
  - Amount is invalid:
    {
      "amount": ["A valid integer is required."],
      "error_key": "validation_error"
    }
  - purchase_order_id is blank:
    {
      "purchase_order_id": ["This field may not be blank."],
      "error_key": "validation_error"
    }
  - purchase_order_name is blank:
    {
      "purchase_order_name": ["This field may not be blank."],
      "error_key": "validation_error"
    }
  - Amount breakdown doesn't total to the amount passed:
    {
      "amount": ["Amount Breakdown mismatch."],
      "error_key": "validation_error"
    }
```

--------------------------------

### Initiating a Payment Request

Source: https://docs.khalti.com/khalti-epayment

Describes the process and payload for initiating a payment request to Khalti. This includes essential parameters like purchase order ID, amount, and return URL.

```APIDOC
Initiating a Payment Request:
  Purpose: To create a payment request to Khalti.
  Process:
    1. Generate a unique `purchase_order_id`.
    2. Make a payment request to Khalti with `purchase_order_id`, `amount` (in paisa), and `return_url`.
    3. User is redirected to the Khalti epayment portal.

  JSON Payload Details:
    - `return_url`: (string) The URL where the user is redirected after payment.
    - `website_url`: (string) The merchant's website URL.
    - `amount`: (integer) The amount in paisa (e.g., 1000 for NPR 10.00).
    - `purchase_order_id`: (string) A unique identifier for the purchase from the merchant's system.
    - `callback_url`: (string, optional) The URL Khalti will call back to confirm the payment status.

  Sample Request Payload:
    {
      "return_url": "https://merchant.com/payment/success",
      "website_url": "https://merchant.com",
      "amount": 1000,
      "purchase_order_id": "ORD-12345",
      "callback_url": "https://merchant.com/payment/callback"
    }
```

--------------------------------

### Initiate Payment Request

Source: https://docs.khalti.com/khalti-epayment

Describes the process and payload structure for initiating a payment request via the Khalti API. A POST request to the initiate endpoint returns a unique `pidx` for future references.

```APIDOC
Endpoint:
  URL: /epayment/initiate/
  Method: POST
  Authorization: Required
  Format: application/json

JSON Payload Details:
  Field Name        | Required | Description
  ------------------|----------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------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------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
```

--------------------------------

### Open Khalti Payment Interface

Source: https://docs.khalti.com/checkout/flutter/khalti-checkout

This snippet demonstrates how to open the Khalti payment gateway interface using the SDK. It assumes an instance of the `Khalti` class is available and calls the `open()` method to push a new route for the payment process.

```dart
khalti.open(context); // Assuming that khalti is a variable that holds the instance of `Khalti`.
```
Tokens:
Raw