A person wants to determine the most expensive computer keyboard and USB drive that can be purchased with a give budget. Given price lists for keyboards and USB drives and a budget, find the cost to buy them. If it is not possible to buy both items, return -1\.

### Example

b = 60 keyboards = \[40, 50, 60\] drives = \[5,8,12\]

The persoan can buy a 40 keyboard + 12 USD drive = 52 or a 50 keyboard + 8 USD drive = 58\. Choose the latter as the more expensive option and return 58\.

**Function Description**

Complete the getMoneySpent function in the editor below.

getMoneySpent has the following parameter(s):

int keyboards\[n\]: the keyboard prices int drives\[m\]: the drive prices int b: the budget

**Returns**

int: the maximum that can be spent, or if it is not possible to buy both items

**Sample Input 0**
    
```
10 2 3
3 1
5 2 8
```

**Sample Output 0**

```
9
```

Explanation 0

Buy the 2nd keyboard and the 3rd USB drive for a total cost of 8 + 1 = 9\.

Sample Input 1
    
```
5 1 1
4
5
```

Sample Output 1
    
```
-1
```

Explanation 1

There is no way to buy one keyboard and one USB drive because 4+5 \> 5, so return -1\.

### Program
    
```
function getMoneySpent(keyboards, drives, b) {
    let bestChoice = -1;
    
    for (const keyboard of keyboards) {
        for (const drive of drives) {
            const currentBudget = keyboard + drive;
            
            if (currentBudget <= b &&  currentBudget > bestChoice) {
                bestChoice = currentBudget;
            }
        }
    }
    
    return bestChoice;
}
```

Electronics Shop - HackerRank Problem - JavaScript Solution


### Problem Statement

Write a function to find the longest common prefix string amongst an array of strings.

If there is no common prefix, return an empty string "".

**Example 1:**

Input: strs = \["flower","flow","flight"\] Output: "fl"

**Example 2:**

Input: strs = \["dog","racecar","car"\] Output: "" Explanation: There is no common prefix among the input strings.

**Constraints:**

1 <= strs.length <= 200 0 <= strs\[i\].length <= 200 strs\[i\] consists of only lowercase English letters.

### Solution
    
```
/**
 * @param {string[]} strs
 * @return {string}
 */
var longestCommonPrefix = function(strs) {
    let commonPrefix = '';
    let firstString = strs[0];

    if (strs.length === 0) return '';

    for (let j = 0; j <= firstString.length; j ++) {
        let isNotMatched = false;
        for (let i = 1; i < strs.length; i++) {
            if (strs[i][j] !== firstString[j]) {
                isNotMatched = true; 
                break;
            }
        }
        if (isNotMatched) {
            break;
        } else if (firstString[j]) {
            commonPrefix += firstString[j];
        }
    }

    return commonPrefix;
}
```

### Sample Output
    
```
// strs = ["flower","flow","flight"]

"fl"
```

Longest Common Prefix Program

A teacher asks the class to open their books to a page number. A student can either start turning pages from the front of the book or from the back of the book. They always turn pages one at a time. When they open the book, page is always on the right side.

When they flip page , they see pages and . Each page except the last page will always be printed on both sides. The last page may only be printed on the front, given the length of the book. If the book is pages long, and a student wants to turn to page , what is the minimum number of pages to turn? They can start at the beginning or the end of the book.

Given and , find and print the minimum number of pages that must be turned in order to arrive at page .

**Sample Input 0**

```
6
2
```

**Sample Output 0**

```
1
```

**Sample Input 1**

```
5
4
```

**Sample Output 1**

```
0
```


## Code
    
```
function pageCount(n, p) {
    let numOfPageTurned = 0;
    
    // for odd pages
    if (p === 1 || p === n ) {
        return numOfPageTurned;
    }
    
    // for even pages
    if (n % 2 === 0 && p === n - 1) {
        return 1;
    }
    
    for (let i = 1; i <= n/2; i++) {
        if (i === p || n-i === p) {
            numOfPageTurned = Math.floor(Math.min(i, n-1) / 2)
            break;
        }
    }
    
    return numOfPageTurned;
}
```

Drawing Book - HackerRank Problem - JavaScript Solution


This is a tutorial to integrate CCAvenue Payment gateway to your website. Please follow the steps carefully for proper integration.

### Prerequisites:

* Active CCAvenue account. -- Merchant ID -- Access Code -- Secret or Encryption or Working Key
* Integration kit from CCAvenue website.
* Whitelist your domain/localhost
* Any text editor. (VS Code Editor Prefered)

## 1\. Account & DomainIf you're testing in your local environment, you must add your localhost to your CCAvenue account. Also, make sure the valid port number is provided to CCAvenue for whitelisting.

Example: If your localhost URL is you`http://localhost:55181/` should have Access code & working key for this domain, not your main domain which you're using for production. Many people use to forget this. If you whitelisted localhost:1234 and if you're using localhost:1235 or some other port number will not work. Please make sure the testing URL matches your CCAVenue details. Please find the screenshot below for more details.

![ccavene-integration-using-nodejs-express-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/ccavene_integration_using_nodejs_express_1_8e31d8c51f.png)

## 2\. Download Integration KitLogin into you CCAvenue account. Then go to Resources -\> Web Integration Kit -\> Download Integration kit & then choose "Download Node.js as shown in the image below.

![ccavene-integration-using-nodejs-express-4-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/ccavene_integration_using_nodejs_express_4_1_a24acb18ac.png)
> 
> Also, I have attached working copy of the Node.js integration kit here: [CCAvenue-NodeJs-IntegrationKit](https://www.aravin.net/uploads/CC_Avenue_Node_Js_Integration_Kit_1_f85a948a79.zip)

## 3\. Choose the Integration MethodCCAvenue gives 3 different types of integration.

* Billing Page (Non-Seamless)
* iFrame Checkout
* Checkout FormIn our tutorial, we are going to use Billing page method. In backend almost these 3 methods are same but front-end behaviors will vary. You can find more details about this integration method in the ccavenue website.

## 4\. Setting up the projectOpen the folder`nonseamless` and open it in any of your favorite editors. I prefer VSCode. Open the project path in command prompt in windows | bash in mac os. Install the dependencies using the following command `npm install` This command will install all the dependencies for the project to be up and running. You will find a new folder.`node_modules`

## 5\. Changes to be done in files1\. Open the file and`ccavRequestHandler.js` replace with your working key and access code. 2\. `ccavResponseHandler.js` - replace with your working key. 3\. `dataFrom.html` - replace the merchant id & success and redirect URL to your localhost URL.

Thanks all, you are ready to collect payment on your website.

## 6\. Start the Node ServerFrom the root of the project, run the following command `node run_node.js` which will run the node server from the file `run_node.js`

## 7\. Test the integrationBrowse the URL: localhost:/about. You will be on the following page.

![ccavene-integration-using-nodejs-express-2-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/ccavene_integration_using_nodejs_express_2_1_c50a41f5b9.png)

![ccavene-integration-using-nodejs-express-3-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/ccavene_integration_using_nodejs_express_3_1_9a1888bed4.png)

### Download the working integration kit[CCAvenue-NodeJs-IntegrationKit](https://www.aravin.net/uploads/CC_Avenue_Node_Js_Integration_Kit_1_f85a948a79.zip)

All the best :) For any clarification please write your comments below

Steps to integrate CCAvenue Payment gateway to your website using Node.js - Express Framework (with Screenshot)


### Problem

String Compression Implement a method to perform basic string compression using the counts of repeated characters. For Example: the string aabcccccaaa would become a2b1c5a3

* If the compressed string would not become smaller than the original string,
* your method should return the original string.
* you can assume the string has only uppercase and lowercase letter (a-z)

### Program
    
```
/**
 * String Compression
 * Implement a method to perform basic string compression using the counts of repeated characters.
 * For Example: the string aabcccccaaa would become a2b1c5a3
 * If the compressed string would not become smaller than the original string,
 * your method should return the original string.
 * you can assume the string has only uppercase and lowercase letter (a-z)
 */

function stringCompression(str) {
    const stringLength = str.length;
    let compressedString = '';
    let charCount = 1;

    for (let i = 0; i < stringLength; i++) {
        
        if (str[i] === str[i+1]) {
            charCount ++;
        }
        else {
            compressedString += str[i];
            compressedString += charCount;
            charCount = 1;
        }
    }

    if (compressedString.length > stringLength) {
        return str;
    }
    else {
        return compressedString;
    }
}

console.log(stringCompression('aabcccccaaa'));
console.log(stringCompression('abc'));
console.log(stringCompression('xyz'));
console.log(stringCompression('AabBcC'));
console.log(stringCompression('cooool'));
```

### output
    
```
a2b1c5a3
abc
xyz
AabBcC
c1o4l1

```

String Compression Program

### Problem

* Palindrome Permutation
* Given a string, write a function to check if it is
* permutation of a palindrom.
* A palindrome is a word or phases that is the same forwards and backwards.
* A permutation is a rearrangement of letters.
* The palindrome does not need to be limited to just dictionary word

### Code
    
```
/**
 * Palindrome Permutation
 * Given a string, write a function to check if it is 
 * permutation of a palindrom.
 * A palindrome is a word or phases that is the same forwards and backwards.
 * A permutation is a rearrangement of letters.
 * The palindrome does not need to be limited to just dictionary word
 */

function isPalindrome(str) {
    const strLength = str.length;

    for (let i = 0; i < strLength / 2; i++) {
        if (str[i] !== str[strLength - 1 - i]) {
            return false;
        }
    }

    return true;
}

console.log(isPalindrome('tacocat'));
console.log(isPalindrome('atcocta'));
console.log(isPalindrome('notapalindrom'));

```

### Output
    
```
true
true
false
```

Palindrome Permutation, Given a string, write a function to check if it is permutation of a palindrom.


## Problem

* One Away
* These are types of edits that can be performed on strings
*   1. insert a character
*   1. remove a character
*   1. replace a character
* Given two strings, write a function to check if they are one edit (or zero) away.

## Program

```
function oneAway(str1, str2) {
    let set = new Set();

    for (let char of str1) {
        set.add(char);
    }

    for (let char of str2) {
        set.delete(char);
    }

    const diff = set.size;
    if (diff === 0 || diff === 1) {
        return true;
    }

    return false;
}
```

## Output
    
```
console.log(oneAway('pale', 'ple'));
console.log(oneAway('pales', 'pale'));
console.log(oneAway('pale', 'bale'));
console.log(oneAway('pale', 'bake'));
```

String One Away Program

As we all know, SHA is an Cryptography hash function that is very much similar to [MD5 hashes](http://aravin.net/how-to-encrypt-plan-text-into-md5-hash-in-csharp-program/). SHA stands for Secure Hash Algorithm,. There are different versions in SHA like SHA-0, SHA-1, SHA-2, and SHA-3\.

We are going to write program about SHA1 hash using C\# code.  We should know some basic thing about SHA1 before getting into code. So here are the some basic thing about SHA1,

1. It is an Hash Function.
2. It produce 160 bit output (20 Byte).
3. Output will be 20 digit (Hexadecimal value)

### Here is the program for SHA1 using C\#:

```
using System;
using System.Security.Cryptography;
using System.Text;
namespace sha
{
class Program
{
static void Main(string[] args)
{


        string plain, hash;
        byte[] temp;

        plain = "Value to be hashed";

        SHA1 sha = new SHA1CryptoServiceProvider();
        // This is one implementation of the abstract class SHA1.
        temp = sha.ComputeHash(Encoding.UTF8.GetBytes(plain));


        //storing hashed vale into byte data type
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i &lt; temp.Length; i++)
             {
                sb.Append(temp[i].ToString("x2"));
              }

        hash = sb.ToString();


        Console.WriteLine(hash);
        Console.ReadKey();
    }
}

}
```

The above code will generate the following output.

21d90aad4d34f48f4aad9b5fa3c37c118af16df9

Same SHA1 hash Program using Input from User:
    
```
using System;
using System.Security.Cryptography;
using System.Text;

namespace sha
{
    class Program
    {
        static void Main(string[] args)
        {

            string plain, hash;
            byte[] temp;

            Console.WriteLine("Enter any value : ");
            plain = Console.ReadLine();

            SHA1 sha = new SHA1CryptoServiceProvider();
            // This is one implementation of the abstract class SHA1.
            temp = sha.ComputeHash(Encoding.UTF8.GetBytes(plain));


            //storing hashed vale into byte data type
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < temp.Length; i++)
                 {
                    sb.Append(temp[i].ToString("x2"));
                  }

            hash = sb.ToString();


            Console.WriteLine(hash);
            Console.ReadKey();
        }
    }
}
```

You can write your comments below.

How to encrypt plain text into SHA1 hash using C# program?


###  Problem

Is Unique: Implement an algorithm to determine if a string has all unique characters, what if you cannot use additional data structure? Assume that string only contains the lowercase letter

### Program
    
```
 function isUniqueCharacters(str) {
    
    let checker = 0;

    // loop through the string and store it to set
    for (let i=0; i<str.length; i++) {

        let val = str.charCodeAt(i) -  97; // 97 - 'a'.charCodeAt(0)
        let bitVal = 1 << val;

        if ((checker & bitVal) > 0) {
            return false;
        }
        else {
            checker = checker | bitVal;
        }
    }

    return true;
}
```

### Output
    
```
console.log(isUniqueCharacters('javascript'));
console.log(isUniqueCharacters('question'));

/**
 * Sample Input 1: javascript
 * Sample Output 1: false
 * 
 * Sample Input 2: question
 * Sample Output 2: true
 */
```

### Source Code

https://github.com/Aravin/dsa/blob/main/javascript/1\_1.js

Implement an algorithm to determine if a string has all unique characters with bitwise operator


### Install xml2js

```
npm install xml2js npm install @types/xml2js --save-dev
```

### Program

```
import { parseString, Builder } from "xml2js";

    // Convert string/XML to JSON
    function toJson(xml: string) {

        parseString(xml, { explicitArray: false }, function(error, result) {
            console.log(result);
        });
    }

    // Convert string/JSON to XML
    function toXML(json: string) {

        const builder = new Builder();
        console.log(builder.buildObject(json));
    }
    // Test Data
    const employeeJson: any = {
        Employee: {
            name: 'Aravind',
            age: 24,
            sex: 'Male'
        
    }
    };

    const employeeXml = "<Employee><name>Aravind</name><age>24</age><sex>Male</sex></Employee>"
    // Result
    toJson(employeeXml);
    toXML(employeeJson);
////
/// SAMPLE OUTPUT 
////

{ Employee: { name: 'Aravind', age: '24', sex: 'Male' } }

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Employee>
  <name>Aravind</name>
  <age>24</age>
  <sex>Male</sex>
</Employee>
    
```

Converting JSON toXML& XML to JSON in Node.js using xml2js package in TypeScript


<p></p><p></p><h2>List of CCAvenue Response Code</h2><table><tbody><tr><td>Name</td><td>Description</td><td>Type (length)</td></tr><tr><td>order_id</td><td>Unique ID sent by the merchant at the time of initiating the transaction.</td><td>Alphanumeric (30)</td></tr><tr><td>tracking_id</td><td>Unique payment reference number generated by CCAvenue for each order.</td><td>Numeric (12)</td></tr><tr><td>bank_ref_no</td><td>Reference number generated by the bank for the transaction.</td><td>Alphanumeric</td></tr><tr><td>order_status</td><td>Status of the transaction. Success Failure Aborted Invalid</td><td>Alphabets (15)</td></tr><tr><td>failure_message</td><td>Reason for failure.</td><td>Alphanumeric</td></tr><tr><td>payment_mode</td><td>Mode of payment used by the customer Credit Card Net banking Debit Card Cash Card Mobile Payment</td><td>Alphabets</td></tr><tr><td>card_name</td><td>The name of the card/bank used by the customer to make the payment. Credit Card - Visa, Mastercard, Amex Netbanking - ICICI, HDFC, SBI etc.</td><td>Alphanumeric</td></tr><tr><td>status_code</td><td>Authorization code received from the bank.</td><td>Numeric (3)</td></tr><tr><td>status_message</td><td>Authorization status message received from the bank.</td><td>Alphanumeric (150)</td></tr><tr><td>currency</td><td>Currency code in which the transaction was processed. INR - Indian Rupee USD - United States Dollar SGD - Singapore Dollar GBP - Pound Sterling EUR - Euro, official currency of Eurozone</td><td>Alphabets (3)</td></tr><tr><td>amount</td><td>Order amount</td><td>Numeric (12, 2)</td></tr><tr><td>billing_ name</td><td>Name of the customer</td><td>Alphabets (60)</td></tr><tr><td>billing_ address</td><td>Customer's billing address</td><td>Alphanumeric (150)</td></tr><tr><td>billing_ city</td><td>Customer's billing city</td><td>Alphabets (30)</td></tr><tr><td>billing_ state</td><td>Customer's billing state</td><td>Alphabets (30)</td></tr><tr><td>billing_ zip</td><td>Customer's billing zip code</td><td>Alphanumeric (15)</td></tr><tr><td>billing_ country</td><td>Customer's billing country</td><td>Alphabets (50)</td></tr><tr><td>billing_ tel</td><td>Customer's phone number</td><td>Numeric (20)</td></tr><tr><td>billing_ email</td><td>Customer's email address</td><td>Alphanumeric (70)</td></tr><tr><td>delivery_ name</td><td>Recipient's name</td><td>Alphabets (60)</td></tr><tr><td>delivery_ address</td><td>Shipping address</td><td>Alphanumeric (150)</td></tr><tr><td>delivery_ city</td><td>Shipping city</td><td>Alphabets (30)</td></tr><tr><td>delivery_ state</td><td>Shipping state</td><td>Alphabets (30)</td></tr><tr><td>delivery_ zip</td><td>Shipping zip code</td><td>Alphanumeric (15)</td></tr><tr><td>delivery_ country</td><td>Shipping country</td><td>Alphabets (50)</td></tr><tr><td>delivery_ tel</td><td>Shipping phone number</td><td>Numeric (22)</td></tr><tr><td>merchant_param1</td><td>Additional information about the transaction sent by the merchant.</td><td>Alphanumeric (100)</td></tr><tr><td>merchant_param2</td><td>Additional information about the transaction sent by the merchant.</td><td>Alphanumeric (100)</td></tr><tr><td>merchant_param3</td><td>Additional information about the transaction sent by the merchant.</td><td>Alphanumeric (100)</td></tr><tr><td>merchant_param4</td><td>Additional information about the transaction sent by the merchant.</td><td>Alphanumeric (100)</td></tr><tr><td>merchant_param5</td><td>Additional information about the transaction sent by the merchant.</td><td>Alphanumeric (100)</td></tr><tr><td>vault</td><td>This parameter can be used if merchant availing the vault option. On using vault functionality if card details are saved at CCAvenue end value returned will be Y. If card details are not saved at CCAvenue end the value returned for this parameter will be N.</td><td>Character (1)</td></tr><tr><td>offer_type</td><td>This parameter can be used for sending additional information if customer has used any discount or promotion while completing the transaction. If customer is using discount-coupon, value of this parameter would be discount. If customer is using promo-code, value of this parameter would be promotion.</td><td>Alphabets (9)</td></tr><tr><td>offer_code</td><td>This parameter can be used for sending additional information about the discount coupon and Promo code used while completing the transaction. If customer has used Discount the value sent would be Discount code. If customer has used Promotion the value sent would be Promo code.</td><td>Alphanumeric (30)</td></tr><tr><td>discount_value</td><td>This parameter can be used for sending additional information about the discounted amount.</td><td>Numeric (12,2)</td></tr></tbody></table><hr><h2>List of CCAvenue Error Codes</h2><table><tbody><tr><td>Error Code</td><td>Short Message</td><td>Long Message</td><td>Correcting this Error</td></tr><tr><td>10002</td><td>Authentication Failed</td><td>Merchant Authentication failed</td><td>This error can be caused by an incorrect merchant ID, an incorrect access code, or if the order originates from an unregistered URL. Make sure that all three of these values are correct. For your security, CCAvenue does not report exactly which of these three values might be in error.</td></tr><tr><td>21001</td><td>Missing Parameter</td><td>order_id:Required parameter missing</td><td>Ensure that the order_id parameter is not blank.</td></tr><tr><td>21002</td><td>Missing Parameter</td><td>currency: Required paramter missing</td><td>Ensure that the currency parameter is not blank.</td></tr><tr><td>21003</td><td>Missing Parameter</td><td>amount:Required parameter missing</td><td>Ensure that the amount parameter is not blank.</td></tr><tr><td>21004</td><td>Missing Parameter</td><td>billing_name: Required parameter missing</td><td>Ensure that the billing_name parameter is not blank.</td></tr><tr><td>21005</td><td>Missing Parameter</td><td>billing_address: Required parameter missing</td><td>Ensure that the billing_address parameter is not blank.</td></tr><tr><td>21006</td><td>Missing Parameter</td><td>billing_city: Required parameter missing</td><td>Ensure that the billing_city parameter is not blank.</td></tr><tr><td>21007</td><td>Missing Parameter</td><td>billing_state: Required parameter missing</td><td>Ensure that the billing_state parameter is not blank.</td></tr><tr><td>21008</td><td>Missing Parameter</td><td>billing_zip: Required parameter missing</td><td>Ensure that the billing_zip parameter is not blank.</td></tr><tr><td>21009</td><td>Missing Parameter</td><td>billing_country: Required parameter missing</td><td>Ensure that the billing_country parameter is not blank.</td></tr><tr><td>21010</td><td>Missing Parameter</td><td>billing_tel: Required parameter missing</td><td>Ensure that the billing_tel parameter is not blank.</td></tr><tr><td>21011</td><td>Missing Parameter</td><td>billing_email: Required parameter missing</td><td>Ensure that the billing_email parameter is not blank.</td></tr><tr><td>21012</td><td>Missing Parameter</td><td>delivery_name: Required parameter missing</td><td>Ensure that the delivery_name parameter is not blank.</td></tr><tr><td>21013</td><td>Missing Parameter</td><td>delivery_address: Required parameter missing</td><td>Ensure that the delivery_address parameter is not blank.</td></tr><tr><td>21014</td><td>Missing Parameter</td><td>delivery_city: Required parameter missing</td><td>Ensure that the billing_city parameter is not blank.</td></tr><tr><td>21015</td><td>Missing Parameter</td><td>delivery_state: Required parameter missing</td><td>Ensure that the delivery_state parameter is not blank.</td></tr><tr><td>21016</td><td>Missing Parameter</td><td>delivery_zip: Required parameter missing</td><td>Ensure that the delivery_zip parameter is not blank.</td></tr><tr><td>21017</td><td>Missing Parameter</td><td>delivery_country: Required parameter missing</td><td>Ensure that the delivery_country parameter is not blank.</td></tr><tr><td>21018</td><td>Missing Parameter</td><td>delivery_tel: Required parameter missing</td><td>Ensure that the delivery_tel parameter is not blank.</td></tr><tr><td>21020</td><td>Missing Parameter</td><td>card_name: Required parameter missing</td><td>Ensure that the card_name parameter is not blank.</td></tr><tr><td>21021</td><td>Missing Parameter</td><td>card_type: Required parameter missing</td><td>Ensure that the card_type parameter is not blank.</td></tr><tr><td>21022</td><td>Missing Parameter</td><td>payment_option: Required parameter missing</td><td>Ensure that the payment_option parameter is not blank.</td></tr><tr><td>21023</td><td>Missing Parameter</td><td>card_number: Required parameter missing</td><td>Ensure that the card_number parameter is not blank.</td></tr><tr><td>21024</td><td>Missing Parameter</td><td>expiry_month: Required parameter missing</td><td>Ensure that the expiry_month parameter is not blank.</td></tr><tr><td>21025</td><td>Missing Parameter</td><td>expiry_year: Required parameter missing</td><td>Ensure that the expiry_year parameter is not blank.</td></tr><tr><td>21026</td><td>Missing Parameter</td><td>cvv_number: Required parameter missing</td><td>Ensure that the cvv_number parameter is not blank.</td></tr><tr><td>21027</td><td>Missing Parameter</td><td>issuing_bank: Required parameter missing</td><td>Ensure that the issuing_bank parameter is not blank.</td></tr><tr><td>21028</td><td>Missing Parameter</td><td>emi_plan_id: Required parameter missing</td><td>Ensure that the emi_plan_id parameter is not blank.</td></tr><tr><td>21029</td><td>Missing Parameter</td><td>emi_tenure_id: Required parameter missing</td><td>Ensure that the emi_tenure_id parameter is not blank.</td></tr><tr><td>21031</td><td>Missing Parameter</td><td>mm_id: Required parameter missing</td><td>Ensure that the mmid parameter is not blank.</td></tr><tr><td>21032</td><td>Missing Parameter</td><td>otp: Required parameter missing</td><td>Ensure that the otp parameter is not blank.</td></tr><tr><td>31001</td><td>Invalid Parameter</td><td>order_id:Invalid Parameter</td><td>Ensure that the order_id parameter is not Invalid.</td></tr><tr><td>31002</td><td>Invalid Parameter</td><td>currency: Invalid Parameter</td><td>Ensure that the currency parameter is not Invalid.</td></tr><tr><td>31003</td><td>Invalid Parameter</td><td>amount:Invalid Parameter</td><td>Ensure that the amount parameter is not Invalid.</td></tr><tr><td>31004</td><td>Invalid Parameter</td><td>billing_name: Invalid Parameter</td><td>Ensure that the billing_name parameter is not Invalid.</td></tr><tr><td>31005</td><td>Invalid Parameter</td><td>billing_address: Invalid Parameter</td><td>Ensure that the billing_address parameter is not Invalid.</td></tr><tr><td>31006</td><td>Invalid Parameter</td><td>billing_city: Invalid Parameter</td><td>Ensure that the billing_city parameter is not Invalid.</td></tr><tr><td>31007</td><td>Invalid Parameter</td><td>billing_state: Invalid Parameter</td><td>Ensure that the billing_state parameter is not Invalid.</td></tr><tr><td>31008</td><td>Invalid Parameter</td><td>billing_zip: Invalid Parameter</td><td>Ensure that the billing_zip parameter is not Invalid.</td></tr><tr><td>31009</td><td>Invalid Parameter</td><td>billing_country: Invalid Parameter</td><td>Ensure that the billing_country parameter is not Invalid.</td></tr><tr><td>31010</td><td>Invalid Parameter</td><td>billing_tel: Invalid Parameter</td><td>Ensure that the billing_tel parameter is not Invalid.</td></tr><tr><td>31011</td><td>Invalid Parameter</td><td>billing_email: Invalid Parameter</td><td>Ensure that the billing_email parameter is not Invalid.</td></tr><tr><td>31012</td><td>Invalid Parameter</td><td>delivery_name: Invalid Parameter</td><td>Ensure that the delivery_name parameter is not Invalid.</td></tr><tr><td>31013</td><td>Invalid Parameter</td><td>delivery_address: Invalid Parameter</td><td>Ensure that the delivery_address parameter is not Invalid.</td></tr><tr><td>31014</td><td>Invalid Parameter</td><td>delivery_city: Invalid Parameter</td><td>Ensure that the billing_city parameter is not Invalid.</td></tr><tr><td>31015</td><td>Invalid Parameter</td><td>delivery_state: Invalid Parameter</td><td>Ensure that the delivery_state parameter is not Invalid.</td></tr><tr><td>31016</td><td>Invalid Parameter</td><td>delivery_zip: Invalid Parameter</td><td>Ensure that the delivery_zip parameter is not Invalid.</td></tr><tr><td>31017</td><td>Invalid Parameter</td><td>delivery_country: Invalid Parameter</td><td>Ensure that the delivery_country parameter is not Invalid.</td></tr><tr><td>31018</td><td>Invalid Parameter</td><td>delivery_tel: Invalid Parameter</td><td>Ensure that the delivery_tel parameter is not Invalid.</td></tr><tr><td>31020</td><td>Invalid Parameter</td><td>card_name: Invalid Parameter</td><td>Ensure that the card_name parameter is not Invalid.</td></tr><tr><td>31021</td><td>Invalid Parameter</td><td>card_type: Invalid Parameter</td><td>Ensure that the card_type parameter is not Invalid.</td></tr><tr><td>31022</td><td>Invalid Parameter</td><td>payment_option: Invalid Parameter</td><td>Ensure that the payment_option parameter is not Invalid.</td></tr><tr><td>31023</td><td>Invalid Parameter</td><td>card_number: Invalid Parameter</td><td>Ensure that the card_number parameter is not Invalid.</td></tr><tr><td>31024</td><td>Invalid Parameter</td><td>expiry_month: Invalid Parameter</td><td>Ensure that the expiry_month parameter is not Invalid.</td></tr><tr><td>31025</td><td>Invalid Parameter</td><td>expiry_year: Invalid Parameter</td><td>Ensure that the expiry_year parameter is not Invalid.</td></tr><tr><td>31026</td><td>Invalid Parameter</td><td>cvv_number: Invalid Parameter</td><td>Ensure that the cvv_number parameter is not Invalid.</td></tr><tr><td>31027</td><td>Invalid Parameter</td><td>issuing_bank: Invalid Parameter</td><td>Ensure that the issuing_bank parameter is not Invalid.</td></tr><tr><td>31028</td><td>Invalid Parameter</td><td>emi_plan_id: Invalid Parameter</td><td>Ensure that the emi_plan_id parameter is not Invalid.</td></tr><tr><td>31029</td><td>Invalid Parameter</td><td>emi_tenure_id: Invalid Parameter</td><td>Ensure that the emi_tenure_id parameter is not Invalid.</td></tr><tr><td>31030</td><td>Invalid Parameter</td><td>order_uid: Invalid Parameter</td><td>Ensure that the order_uid parameter is not Invalid.</td></tr><tr><td>31031</td><td>Invalid Parameter</td><td>mm_id: Invalid Parameter</td><td>Ensure that the mm_id parameter is not Invalid.</td></tr><tr><td>31032</td><td>Invalid Parameter</td><td>otp: Invalid Parameter</td><td>Ensure that the otp parameter is not Invalid.</td></tr><tr><td>31034</td><td>Invalid Parameter</td><td>Selected EMI facility is not valid for entered card</td><td>As verified by bank EMI transactions are not enabled on this card.</td></tr></tbody></table><p></p><p></p><p></p>


List of CCAvenue Response Parameters & Error Codes


Hi All, this tutorial is about CCAvenue payment gateway integration for ASP.NET Razor website (.CSHTML). If you are using ASP.NET web pages (.ASPX) you can check the tutorial [here](https://www.aravin.net/).

## Pre-Requisites

1. Visual Studio 2012 or Latest
2. CCAvenue Active account with
  1. Merchant ID
  2. Encryption Key
  3. Access Code
3. CCAvenue Integration Kit for ASP.NET
4. Custom ASP.NET Integration Kit for Razor (Download here: [ccavenue\_aspnet\_razor\_kit\_1](https://res.cloudinary.com/aravin/raw/upload/v1629652225/CC_Avenue_ASPNET_Razor_Kit_1_3_65d2691a74.zip))

## Steps for Integration

### 1\. Download Custom ASP.NET Integration Kit for RazorDownload the ASP.NET Integration Kit for Razor from the above link and import into your project. \[[Download Now](https://res.cloudinary.com/aravin/raw/upload/v1629652225/CC_Avenue_ASPNET_Razor_Kit_1_3_65d2691a74.zip)\]

### 2\. Adding reference to the project`Download the CCAvenue Integration kit and add Right click on your visual studio project -> Add -> Reference `and choose the reference file `MCPG.CCA.Util.dll` and import it into the visual studio project.

![cca_reference-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/cca_reference_1_0aeed31caa.png)

### 3\. Adding Access Code, Encryption and Merchant IDAdd Working key and Merchant ID to index.cshml file.
> 
> Search for Snippet
>     
>     string workingKey = "add_your_32_bit_working_key_here"; 
> 
> Replace with your 32 secret key given from CCAvenue

Add Working Key, Access Code to processor.chtml file.
> 
> Search for Snippet
>     
>     var workingKey = "add_your_32_bit_working_key_here"; 
> 
> and Snippet
>     
>     var strAccessCode = "add_your_access_key_here"; 
> 
> Replace with your working key and access key.

### 4\. Set Test/Production environmentOpen `processor.cshtml` and change form action as following,

For Testing, `https://test.ccavenue.com/transaction/transaction.do?command=initiateTransaction`

For Release, `https://secure.ccavenue.com/transaction/transaction.do?command=initiateTransaction`

![cca_environment-1.jpeg](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/cca_environment_1_56cc2fecd8.jpeg)

### 5\. Build & Run the projecti. Clean the project.

ii. Build the Project.

iii. Run the Project.

---

That's all :)

if you did all the steps as mentioned, you will get the website as shown below

![cca_checkout_page-1.jpeg](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/cca_checkout_page_1_0c1595ab0d.jpeg)

Once you filled out this form, you will redirect to CCAvenue checkout page. Kindly drop your concern/issues/suggestion in below comment section.

How to integrate CCAvenue payment gateway into ASP.NET Razor website? (with steps & screenshots)


### Steps to align textbox and label

Step 1: Center a `div` tag using margin as `0 auto`.

Step 2: Align the `label` to `right` and make it `float` to `left`.

Step 3: Align the `textbox` to `lef`t and make it `float` to `right`.

Step 4: Make both label and textbox to `inline-block`.


### HTML & CSS

```
<!DOCTYPE html>
<html>
<head>
	<title>Centering a form</title>
</head>
<body>
	<div class="form">
		<label>Name</label>
		<input type="text" name="name">

		<label>Email</label>
		<input type="text" name="email">

		<label>Phone</label>
		<input type="text" name="phone">
	</div>
</body>
</html>

<style type="text/css">
	.form {
		margin: 0 auto;
		width: 210px;
	}

	.form label{
		display: inline-block;
		text-align: right;
		float: left;
	}

	.form input{
		display: inline-block;
		text-align: left;
		float: right;
	}
</style>
```

Live demo here: https://jsfiddle.net/durtpwvx/

How to center align the label and the textbox in HTML horizontally in webpage

## Program

```
/**
 * Is Unique: Implement an algorithm to determine if a string has all unique characters,
 */
function isUniqueCharacters(str) {
    
    // using set to store only unique chars
    let set = new Set();

    // loop through the string and store it to set
    for (let i=0; i<str.length; i++) {
        set.add(str[i]);
    }

    return str.length === set.size ? true : false
}
```

## Sample Output

```
console.log(isUniqueCharacters('javascript'));
console.log(isUniqueCharacters('question'));

/**
 * Sample Input 1: javascript
 * Sample Output 1: false
 * 
 * Sample Input 2: question
 * Sample Output 2: true
 */

```


Implement an algorithm to determine if a string has all unique characters

## Problem

Check Permutation: Given two strings, write a method to decide if one is a permutation of the other

## Code
    
```
/** Check Permutation: Given two strings,
 * write a method to decide if one is a permutation of the other
 */

function checkPermutation(str1, str2) {

    const set = new Set();

    if (str1.length !== str2.length) {
        return false;
    }

    for (let i = 0; i < str1.length; i++) {
        const index = str2.indexOf(str1[i]);

        if (index === -1 || set.has(index)) {
            return false;
        } else {
            set.add(index);
        }
    }

    return true;
}
```

## Sample Output:
    
```
console.log(checkPermutation('one', 'neo'));
console.log(checkPermutation('abc', 'xyz'));
console.log(checkPermutation('zeroo', 'heroz'));

/** Sample Output
 * true
 * false
 * false
 */
```

Implement an algorithm to Check Permutation of two strings

### CCAvenue Response CodesNameDescriptionType (length)

order\_idUnique ID sent by the merchant at the time of initiating the transaction.Alphanumeric (30)

tracking\_idUnique payment reference number generated by CCAvenue for each order.Numeric (12)

bank\_ref\_noReference number generated by the bank for the transaction.Alphanumeric

order\_statusStatus of the transaction.Alphabets (15)

Success

Failure

Aborted

Invalid

failure\_messageReason for failure.Alphanumeric

payment\_modeMode of payment used by the customerAlphabets

Credit Card

Net banking

Debit Card

Cash Card

Mobile Payment

card\_nameThe name of the card/bank used by the customer to make the payment. Credit Card - Visa, Mastercard, Amex Netbanking - ICICI, HDFC, SBI etc.Alphanumeric

status\_codeAuthorization code received from the bank.Numeric (3)

status\_messageAuthorization status message received from the bank.Alphanumeric (150)

currencyCurrency code in which the transaction was processed.Alphabets (3)

INR - Indian Rupee

USD - United States Dollar

SGD - Singapore Dollar

GBP - Pound Sterling

EUR - Euro, official currency of Eurozone

amountOrder amountNumeric (12, 2)

billing\_ nameName of the customerAlphabets (60)

billing\_ addressCustomer's billing addressAlphanumeric (150)

billing\_ cityCustomer's billing cityAlphabets (30)

billing\_ stateCustomer's billing stateAlphabets (30)

billing\_ zipCustomer's billing zip codeAlphanumeric (15)

billing\_ countryCustomer's billing countryAlphabets (50)

billing\_ telCustomer's phone numberNumeric (20)

billing\_ emailCustomer's email addressAlphanumeric (70)

delivery\_ nameRecipient's nameAlphabets (60)

delivery\_ addressShipping addressAlphanumeric (150)

delivery\_ cityShipping cityAlphabets (30)

delivery\_ stateShipping stateAlphabets (30)

delivery\_ zipShipping zip codeAlphanumeric (15)

delivery\_ countryShipping countryAlphabets (50)

delivery\_ telShipping phone numberNumeric (22)

merchant\_param1Additional information about the transaction sent by the merchant.Alphanumeric (100)

merchant\_param2Additional information about the transaction sent by the merchant.Alphanumeric (100)

merchant\_param3Additional information about the transaction sent by the merchant.Alphanumeric (100)

merchant\_param4Additional information about the transaction sent by the merchant.Alphanumeric (100)

merchant\_param5Additional information about the transaction sent by the merchant.Alphanumeric (100)

vaultThis parameter can be used if merchant availing the vault option. On using vault functionality if card details are saved at CCAvenue end value returned will be Y. If card details are not saved at CCAvenue end the value returned for this parameter will be N.Character (1)

offer\_typeThis parameter can be used for sending additional information if customer has used any discount or promotion while completing the transaction. If customer is using discount-coupon, value of this parameter would be discount. If customer is using promo-code, value of this parameter would be promotion.Alphabets (9)

offer\_codeThis parameter can be used for sending additional information about the discount coupon and Promo code used while completing the transaction. If customer has used Discount the value sent would be Discount code. If customer has used Promotion the value sent would be Promo code.Alphanumeric (30)

discount\_valueThis parameter can be used for sending additional information about the discounted amount.Numeric (12,2)

retryThis denotes whether the transaction is a retry transaction or not.Character (1)

Value:

Y - Retry Transaction

N - Not a Retry Transaction

Note: A transaction done for the first time would be marked as 'N', whereas the subsequent valid retry attempts would be marked as 'Y'.

response\_codeThis is the code assigned to each type of response received from the bank.Numeric (5)

Complete list of CCAvenue Response code with description


## About this tutorialThis is an end-to-end guide to integrating a CCAvenue payment gateway into ASP.NET web application using official kit. Starting from account setup to successful payment.

## Pre-Requirement

1. Visual Studio
2. Active CCAvenue account
  1. Merchant ID
  2. Access Code
  3. Working Key
3. Official CCAvenue kit
4. Little knowledge about C\# & ASP.NET

### Setting up your CCAvenue account for localhostIn order to run your CCAvenuepayment gateway in localhost, we need to add our localhost into CCAvenue account. You have to write an email to `service@ccavenue.com` and ask him to add your localhost.  Kindly refer screenshot below for more details.

Example: http://localhost:55181/

#### Screenshot 1

![CCAvenue-Integration-Guide-2-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_2_1_e9173aa429.png)

### Download Integration Kit from CCAvenue websiteIntegration kit will be available on http://ccavenue.com → Resources → Web Integration Kit → Download Integration Kit → Download ASP.NET 3.5

![CCAvenue-Integration-Guide-3-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_3_1_6de90cb895.png)

Also, you can download from here: [ASP.Net\_Kit\_Version\_3.5](https://res.cloudinary.com/aravin/raw/upload/v1629651987/ASP_Net_Kit_Version_3_5_1_1ebd67b9ab.zipthe)

### Extract the Integration Kit

### Open the Project in Visual Studio

1. Open Visual Studio
2. Choose Open → Project/Solution from the file menu.

![CCAvenue-Integration-Guide-5-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_5_1_a5bd98de1e.png)

1. Browse to the downloaded Integration kit. Open the `NON-SEAMLESS KIT`

![CCAvenue-Integration-Guide-6-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_6_1_adb7d4c73b.png)

1. Open `MCPG.ASP.net.ENC`

![CCAvenue-Integration-Guide-7-2.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_7_2_88c5aa22be.png)

### Add Reference to the project \[Very Important\]Many people used to face an issue in this stage. But it is really an easy step. Kindly follow the screenshot.

Right-click the References in solution explorer → Add Reference

![CCAvenue-Integration-Guide-8-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_8_1_4746e10cd7.png)
> 
> Note: Reference DLL file will be available in downloaded integration kit itself.

Browse the downloaded folder

1. bin → MCPG.ASP.net.ENC.dll & add it to the project.
2. lib → MCPG.CCA.Util.dll & add it to project.
> 
> Note: REMOVE existing dll, if any. You have to add fresh dll.

### Add localhost to the projectThis step is mandatory to run the CCAvenue setup in local system i.e in a development system. If you didn't ask localhost, this setup won't work because by default asp.net project will point to some default IP like `http://127.0.0.1/`

So, better add your localhost i.e In my case it is which `http://localhost:55181/` is same as in my CCAvenue Account, which we have added in step 1\.
> 
> Right click project → Properties

!\[CCAvenue-Integration-Guide-10-1.png\](https://res.cloudinary.com/aravin/image/upload/v1629651261/CC\_Avenue\_Integration\_Guide\_10\_1\_d723bec42c.png)

### Change Merchant ID, Acess Code and Working Key in our applicationPages to be modified:-

1. ccavRequestHandler.aspx.cs
2. ccavResponseHandler.aspx.cs
3. dataFrom.htmChange workingKey and strAccessCode in ccavRequestHandler.aspx.cs !\[CCAvenue-Integration-Guide-11-1.png\](https://res.cloudinary.com/aravin/image/upload/v1629651263/CC\_Avenue\_Integration\_Guide\_11\_1\_59b110868b.png)

Change workingKey again in  ccavResponseHandler.aspx.cs

![CCAvenue-Integration-Guide-12-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_12_1_966bcf8cbb.png)

Change merchant\_id, redirect\_url, cancel\_url - VERY IMPORTANT

![CCAvenue-Integration-Guide-13-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_13_1_b267fab24e.png)

#### Great :) If you followed all the step, you can build & run

### Choose between Testing/Live environmentYou can choose Testing or Live environment from the `ccavRequestHandler.aspx`

For Live Environment 
    
    https://secure.ccavenue.com/transaction/transaction.do?command=initiateTransaction 

For Testing Environment
    
    https://test.ccavenue.com/transaction/transaction.do?command=initiateTransaction 

### Making Payment in Live (Production) EnvironmentRun the application, you will see the following account.

![CCAvenue-Integration-Guide-15-1-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_15_1_1_cac29ac52f.png)

Fill the details & Proceed to checkout

Choose the preferred payment gateway from Credit Card/Debit Card/Net Baking etc..

Enter the required details and click on make payment

![CCAvenue-Integration-Guide-17-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_17_1_4e9e263a76.png)

Finally, Complete the payment :)

![CCAvenue-Integration-Guide-18-1.png](https://aravin-net-cms.s3.ap-south-1.amazonaws.com/CC_Avenue_Integration_Guide_18_1_ee85909703.png)

That's all :) You can push your code to Live Website :)

I tried my best to cover all the steps in screenshot & steps. If I missed any steps, kindly drop the queries in a comment section.

Also, for any clarification or doubt, please write back to me on comment section. I will try to reply as soon as possible.

This is an end-to-end guide to integrating a CCAvenue payment gateway into ASP.NET web application using official kit. Starting from account setup to successful payment.


Complete guide to integrate CCAvenue Payment gateway into ASP.NET website - with Screenshot

HTML, JavaScript, Node.js, TypeScrip, AWS, GCP, Data Structure & Algorithm, etc

Hello 👋🏻 I'm Aravind Appadurai

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