Upgraded to latest version

.gitignore

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+.DS_Store

Magento_V1.x/README.md

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+# Paytm Payment plugin for Magento version 1.x
+* Developer Docs: https://developer.paytm.com/docs/eCommerce-plugin/magento/#v1-x

Magento_V1.x/app/code/community/One97/Paytm/Block/Adminhtml/Order/View/Tab/Contents.php

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+<?php
+class One97_Paytm_Block_Adminhtml_Order_View_Tab_Contents extends Mage_Adminhtml_Block_Template implements Mage_Adminhtml_Block_Widget_Tab_Interface {
+    public function _construct()
+    {
+        parent::_construct();
+        $this->setTemplate('paytm/order/view/tab/contents.phtml');
+    }
+
+    public function getTabLabel() {
+        return $this->__('Paytm Response');
+    }
+
+    public function getTabTitle() {
+        // return $this->__($test);
+        return $this->__('Paytm Response');
+    }
+
+    public function canShowTab() {
+        $order=$this->getOrder();
+        $orderId=$order->getIncrementId();
+        $connectionRead = Mage::getSingleton('core/resource')->getConnection('core_write');
+        $tableName = Mage::getSingleton('core/resource')->getTableName('paytm_order_data');
+        $query="SELECT id FROM ".$tableName." WHERE order_id='".$orderId."' ORDER BY ID DESC";
+        $results = $connectionRead->fetchAll($query);
+        if(isset($results[0]['id'])){
+            return true;
+        }else{
+            return false;
+        }
+    }
+
+    public function isHidden() {
+        return false;
+    }
+
+    public function getOrder(){
+        return Mage::registry('current_order');
+    }
+
+    public function paytmResponse($fetchButton=false){
+        $order=$this->getOrder();
+        $orderId=$order->getIncrementId();
+        $connectionRead = Mage::getSingleton('core/resource')->getConnection('core_write');
+        $tableName = Mage::getSingleton('core/resource')->getTableName('paytm_order_data');
+        $query="SELECT * FROM ".$tableName." WHERE order_id='".$orderId."' ORDER BY ID DESC";
+        $results = $connectionRead->fetchAll($query);
+        if($fetchButton){
+            if(isset($results[0]['paytm_response'])){
+                $tableBody='<button title="Update Status" type="button" id="fetchStatusBtn" class="scalable" onclick="fetchStatus()" style="float:right;"><span><span><span>Fetch Status</span></span></span></button> <input type="hidden" class="paytmResponseId" value="'.$results[0]['id'].'">';
+            }
+        }else{
+            $tableBody='<tr class="even pointer"> <td colspan="2" style="text-align: center;">No Data</td> </tr>';
+            if(isset($results[0]['paytm_response'])){
+                if(trim($results[0]['paytm_response'])!=''){
+                    $jsonResponse = json_decode($results[0]['paytm_response'], true);
+                    if(is_array($jsonResponse)){
+                        $tableBody='';
+                        ksort($jsonResponse);
+                        foreach($jsonResponse as $key=>$value){
+                            if($key=="STATUS"){
+                                $tableBody.='<tr class="even pointer"> <td class=" ">'.$key.'</td> <td class="a-right a-right "><span style="    font-weight: 900;">'.$value.'</span> </td> </tr>';
+                            }else{
+                                $tableBody.='<tr class="even pointer"> <td class=" ">'.$key.'</td> <td class="a-right a-right ">'.$value.' </td> </tr>';
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return $tableBody;
+    }
+}

Magento_V1.x/app/code/community/One97/Paytm/Helper/Data.php

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+<?php
+//contains utility functions for encryption decrytion
+
+class One97_paytm_Helper_Data extends Mage_Payment_Helper_Data {
+	// PaytmConstants.php start
+	CONST TRANSACTION_URL_PRODUCTION			= "https://securegw.paytm.in/order/process";
+	CONST TRANSACTION_STATUS_URL_PRODUCTION		= "https://securegw.paytm.in/order/status";
+
+	CONST TRANSACTION_URL_STAGING 				="https://securegw-stage.paytm.in/order/process";
+	CONST TRANSACTION_STATUS_URL_STAGING		= "https://securegw-stage.paytm.in/order/status";
+
+	CONST SAVE_PAYTM_RESPONSE 					= true;
+	CONST CHANNEL_ID							= "WEB";
+	CONST APPEND_TIMESTAMP						= false;
+	CONST X_REQUEST_ID							= "PLUGIN_MAGENTO_";
+
+	CONST MAX_RETRY_COUNT						= 3;
+	CONST CONNECT_TIMEOUT						= "10";
+	CONST TIMEOUT								= "10";
+
+	CONST LAST_UPDATED							= "20200120";
+	CONST PLUGIN_VERSION						= "2.0";
+
+	CONST CUSTOM_CALLBACK_URL					= "";
+	// PaytmConstants.php end
+
+	public function getPendingPaymentStatus()
+    {
+        if (version_compare(Mage::getVersion(), '1.4.0', '<')) {
+            return Mage_Sales_Model_Order::STATE_HOLDED;
+        }
+        return Mage_Sales_Model_Order::STATE_PENDING_PAYMENT;
+    }
+
+	// PaytmChecksum.php start
+	private static $iv = "@@@@&&&&####$$$$";
+ 	static public function encrypt($input, $key) {
+		$key = html_entity_decode($key);
+
+		if(function_exists('openssl_encrypt')){
+			$data = openssl_encrypt ( $input , "AES-128-CBC" , $key, 0, self::$iv );
+		} else {
+			$size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, 'cbc');
+			$input = self::pkcs5Pad($input, $size);
+			$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', 'cbc', '');
+			mcrypt_generic_init($td, $key, self::$iv);
+			$data = mcrypt_generic($td, $input);
+			mcrypt_generic_deinit($td);
+			mcrypt_module_close($td);
+			$data = base64_encode($data);
+		}
+		return $data;
+	}
+
+	static public function decrypt($encrypted, $key) {
+		$key = html_entity_decode($key);
+
+		if(function_exists('openssl_decrypt')){
+			$data = openssl_decrypt ( $encrypted , "AES-128-CBC" , $key, 0, self::$iv );
+		} else {
+			$encrypted = base64_decode($encrypted);
+			$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', 'cbc', '');
+			mcrypt_generic_init($td, $key, self::$iv);
+			$data = mdecrypt_generic($td, $encrypted);
+			mcrypt_generic_deinit($td);
+			mcrypt_module_close($td);
+			$data = self::pkcs5Unpad($data);
+			$data = rtrim($data);
+		}
+		return $data;
+	}
+
+	static public function generateSignature($params, $key) {
+		if(!is_array($params) && !is_string($params)){
+			throw new Exception("string or array expected, ".gettype($params)." given");			
+		}
+		if(is_array($params)){
+			$params = self::getStringByParams($params);			
+		}
+		return self::generateSignatureByString($params, $key);
+	}
+
+	static public function verifySignature($params, $key, $checksum){
+		if(!is_array($params) && !is_string($params)){
+			throw new Exception("string or array expected, ".gettype($params)." given");
+		}
+		if(is_array($params)){
+			$params = self::getStringByParams($params);
+		}		
+		return self::verifySignatureByString($params, $key, $checksum);
+	}
+
+	static private function generateSignatureByString($params, $key){
+		$salt = self::generateRandomString(4);
+		return self::calculateChecksum($params, $key, $salt);
+	}
+
+	static private function verifySignatureByString($params, $key, $checksum){
+		$paytm_hash = self::decrypt($checksum, $key);
+		$salt = substr($paytm_hash, -4);
+		return $paytm_hash == self::calculateHash($params, $salt) ? true : false;
+	}
+
+	static private function generateRandomString($length) {
+		$random = "";
+		srand((double) microtime() * 1000000);
+
+		$data = "9876543210ZYXWVUTSRQPONMLKJIHGFEDCBAabcdefghijklmnopqrstuvwxyz!@#$&_";	
+
+		for ($i = 0; $i < $length; $i++) {
+			$random .= substr($data, (rand() % (strlen($data))), 1);
+		}
+
+		return $random;
+	}
+
+	static private function getStringByParams($params) {
+		ksort($params);		
+		$params = array_map(function ($value){
+			return ($value == null) ? "" : $value;
+	  	}, $params);
+		return implode("|", $params);
+	}
+
+	static private function calculateHash($params, $salt){
+		$finalString = $params . "|" . $salt;
+		$hash = hash("sha256", $finalString);
+		return $hash . $salt;
+	}
+
+	static private function calculateChecksum($params, $key, $salt){
+		$hashString = self::calculateHash($params, $salt);
+		return self::encrypt($hashString, $key);
+	}
+
+	static private function pkcs5Pad($text, $blocksize) {
+		$pad = $blocksize - (strlen($text) % $blocksize);
+		return $text . str_repeat(chr($pad), $pad);
+	}
+
+	static private function pkcs5Unpad($text) {
+		$pad = ord($text{strlen($text) - 1});
+		if ($pad > strlen($text))
+			return false;
+		return substr($text, 0, -1 * $pad);
+	}
+	// PaytmChecksum.php end
+
+	// PaytmHelper.php start
+	/**
+	* exclude timestap with order id
+	*/
+	public static function getTransactionURL($isProduction = 0){		
+		if($isProduction == 1){
+			$transactionURL= One97_paytm_Helper_Data::TRANSACTION_URL_PRODUCTION;
+		}else{
+			$transactionURL= One97_paytm_Helper_Data::TRANSACTION_URL_STAGING;			
+		}
+		return $transactionURL;
+	}
+	/**
+	* exclude timestap with order id
+	*/
+	public static function getTransactionStatusURL($isProduction = 0){		
+		if($isProduction == 1){
+			return One97_paytm_Helper_Data::TRANSACTION_STATUS_URL_PRODUCTION;
+		}else{
+			return One97_paytm_Helper_Data::TRANSACTION_STATUS_URL_STAGING;			
+		}
+	}
+
+	public static function getcURLversion(){    
+		if(function_exists('curl_version')){
+			$curl_version = curl_version();
+			if(!empty($curl_version['version'])){
+				return $curl_version['version'];
+			}
+		}
+		return false;
+	}
+
+	public static function executecUrl($apiURL, $requestParamList) {
+		$responseParamList = array();
+		$JsonData = json_encode($requestParamList);
+		$postData = 'JsonData='.urlencode($JsonData);
+		$ch = curl_init($apiURL);
+		curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
+		curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
+		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
+		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, One97_paytm_Helper_Data::CONNECT_TIMEOUT);
+		curl_setopt($ch, CURLOPT_TIMEOUT, One97_paytm_Helper_Data::TIMEOUT);
+
+		/*
+		** default value is 2 and we also want to use 2
+		** so no need to specify since older PHP version might not support 2 as valid value
+		** see https://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYHOST.html
+		*/
+		// curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 2);
+
+		// TLS 1.2 or above required
+		// curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);
+
+		curl_setopt($ch, CURLOPT_HTTPHEADER, array(
+			'Content-Type: application/json', 
+			'Content-Length: ' . strlen($postData))
+		);
+		$jsonResponse = curl_exec($ch);   
+
+		if (!curl_errno($ch)) {
+			return json_decode($jsonResponse, true);
+		} else {
+			return false;
+		}
+	}
+	// PaytmHelper.php end
+}