diff --git a/includes/PhonePePaymentMethodController.inc b/includes/PhonePePaymentMethodController.inc
index 8b13789..aa1e480 100644
--- a/includes/PhonePePaymentMethodController.inc
+++ b/includes/PhonePePaymentMethodController.inc
@@ -1 +1,270 @@
+<?php
+
+/**
+ * Contains PhonePePaymentMethodController.
+ */
+
+/**
+ * An PhonePe payment method.
+ */
+class PhonePePaymentMethodController extends PaymentMethodController {
+
+  /**
+   * The production server.
+   */
+  const SERVER_PRODUCTION = 0;
+
+  /**
+   * The testing server.
+   */
+  const SERVER_TESTING = 1;
+
+  /**
+   * The production server URL.
+   */
+  const SERVER_PRODUCTION_URL = 'https://mercury.phonepe.com';
+
+  /**
+   * The testing server URL.
+   */
+  const SERVER_TESTING_URL = 'https://mercury-uat.phonepe.com/v3/debit';
+
+  public $controller_data_defaults = array(
+    'merchantid' => '',
+    'merchantuserid' => '',
+    'apikey1' => '',
+    'apikey2' => '',
+    'apikey3' => '',
+    'apikey4' => '',
+    'apikey5' => '',
+    'apikey6' => '',
+    'apikey7' => '',
+    'apikey8' => '',
+    'server' => self::SERVER_PRODUCTION,
+  );
+
+  public $payment_method_configuration_form_elements_callback = 'phonepe_payment_method_configuration_form_elements';
+  
+  function __construct() {
+    $this->title = t('Phonepe');
+    $this->description = t("Phonepe Payment Gateway.");
+  }
+
+  /**
+   * Implements PaymentMethodController::execute().
+   */
+  function execute(Payment $payment) {
+    entity_save('payment', $payment);
+    $_SESSION['phonepe_pid'] = $payment->pid;
+    drupal_goto('phonepe/redirect/' . $payment->pid);
+  }
+
+  /**
+   * Returns the API server URL.
+   *
+   * @throws InvalidArgumentException
+   *
+   * @param int $server
+   *   self::SERVER_PRODUCTION or self::SERVER_TESTING.
+   *
+   * @return string
+   */
+  function debitURL($server) {
+    $urls = array(
+      $this::SERVER_PRODUCTION => $this::SERVER_PRODUCTION_URL,
+      $this::SERVER_TESTING => $this::SERVER_TESTING_URL,
+    );
+    if (array_key_exists($server, $urls)) {
+      return url($urls[$server], array(
+        'external' => TRUE,
+      ));
+    }
+    else {
+      throw new InvalidArgumentException(t('Server type does not exist.'));
+    }
+  }
+
+    /**
+   * Returns the Key index and Key.
+   *
+   * @throws InvalidArgumentException
+   *
+   *
+   * @return array
+   */
+  function saltKey(Payment $payment) {
+    // Randomize hash key.
+    $saltkeys = array();
+    array_push($saltkeys, $payment->method->controller_data['apikey1']);
+    array_push($saltkeys, $payment->method->controller_data['apikey2']);
+    if(!empty($payment->method->controller_data['apikey3'])) 
+      array_push($saltkeys, $payment->method->controller_data['apikey3']);
+    if(!empty($payment->method->controller_data['apikey4'])) 
+      array_push($saltkeys, $payment->method->controller_data['apikey4']);
+    if(!empty($payment->method->controller_data['apikey5'])) 
+      array_push($saltkeys, $payment->method->controller_data['apikey5']);
+    if(!empty($payment->method->controller_data['apikey6'])) 
+      array_push($saltkeys, $payment->method->controller_data['apikey6']);
+    if(!empty($payment->method->controller_data['apikey7'])) 
+      array_push($saltkeys, $payment->method->controller_data['apikey7']);
+    if(!empty($payment->method->controller_data['apikey8'])) 
+      array_push($saltkeys, $payment->method->controller_data['apikey8']); 
+
+    if (!empty($saltkeys)) {
+      $saltkey = array();
+      $saltindex = array_rand($saltkeys,1); 
+      $saltkey[$saltindex+1] = $saltkeys[$saltindex];
+      return $saltkey;
+    }
+    else {
+      throw new InvalidArgumentException(t('Invalid Salt Key.'));
+    }
+  }
+
+  /**
+   * Returns a map of PhonePe statuses to Payment statuses.
+   *
+   * @return array
+   *   Keys are PhonePe statuses, values are Payment statuses.
+   */
+  function statusMap() {
+    return array(
+      //"Payment was not initiated after coming to PhonePe container".
+      'TRANSACTION_NOT_FOUND' => PAYMENT_STATUS_UNKNOWN,
+      //"The request is not valid".
+      'BAD_REQUEST' => PAYMENT_STATUS_UNKNOWN,
+      //"X-VERIFY header is incorrect".
+      'AUTHORIZATION_FAILED' => PAYMENT_STATUS_AUTHORIZATION_FAILED,
+      //"Something went wrong".
+      'INTERNAL_SERVER_ERROR' => PAYMENT_STATUS_FAILED,
+      //"Payment is successful".
+      'PAYMENT_SUCCESS' => PAYMENT_STATUS_SUCCESS,
+      //"Payment failed".
+      'PAYMENT_ERROR' => PAYMENT_STATUS_FAILED,
+      //"Payment failed".
+      'PAYMENT_FAILED' => PAYMENT_STATUS_FAILED,
+      //"Payment is pending".
+      'PAYMENT_PENDING' => PAYMENT_STATUS_PENDING,
+      //"Payment cancelled by merchant".
+      'PAYMENT_CANCELLED' => PAYMENT_STATUS_CANCELLED,
+      //"Payment declined by user".
+      'PAYMENT_DECLINED' => PAYMENT_STATUS_FAILED,
+    );
+  }
+
+  /**
+   * Converts an PhonePe status to a Payment status.
+   *
+   * @param string $phonepe_status
+   *
+   * @return string
+   */
+  function convertStatus($phonepe_status) {
+    $status_map = $this->statusMap();
+    if (array_key_exists($phonepe_status, $status_map))
+      return $status_map[$phonepe_status];
+      return PAYMENT_STATUS_UNKNOWN;
+  }
+
+  
+
+  /**
+   * Sets up redirect POST data.
+   *
+   * @param Payment $payment
+   *
+   * @return array
+   *   Keys are POST parameter names, values are values.
+   */
+  function phonepePostData(Payment $payment) {
+
+    $return_url = url('phonepe/return', array(
+      'absolute' => TRUE,
+    ));
+    
+    // Currency check.
+    $merchantid = $payment->method->controller_data['merchantid']; 
+    $transactionId = 'TX'.$payment->method->pmid."PY".$payment->pid;
+    $orderId = $payment->context_data['order_id'];
+    $merchantUserId = (string)$payment->uid; 
+    // Convert to paisa.
+    $amount = $payment->totalAmount(TRUE)*100;
+    
+     $data = array(
+       "merchantId" => $merchantid, 
+       "transactionId" => $transactionId,
+       "merchantUserId" => $merchantUserId,
+       "amount" => $amount,
+       "merchantOrderId" => $orderId,
+     );
+
+     // Get salt key and index.
+     $salt = $this->saltKey($payment);
+     $salt_key = reset($salt); 
+     $salt_index = key($salt); 
+
+     $encodedRequest = base64_encode(json_encode($data));
+     $SHAval = hash('sha256',  $encodedRequest."/v3/debit".$salt_key);
+     $SHAval .= "###".$salt_index;
+ 
+    $requestPayload = json_encode(array(
+      "request"=>$encodedRequest
+    ));
+  
+     $postData['server']= $this->debitURL($payment->method->controller_data['server']);
+     $postData['x-callback-url'] = $return_url;
+     $postData['x-verify'] = $SHAval;
+     $postData['request'] = $requestPayload;
+     return $postData;
+  }
+
+
+   /**
+   * Gets PhonePe response data.
+   *
+   * @return array
+   */
+  function responseData() {
+    $data_raw = array_merge($_POST);
+    unset($data_raw['q']);
+    return $data_raw;
+  } 
+
+  /**
+   * Check PhonePe Status.
+   *
+   * @return string|bool $string_or_boolean
+   */
+  function checkTransactionStatus(array $data, Payment $payment) {
+    $checksum = $data['checksum'];
+    unset($data['checksum']);
+
+    $cs_keyvalue = explode('###', $checksum);
+    $cs_index = 'apikey'.$cs_keyvalue[1];
+    $salt = $payment->method->controller_data[$cs_index];
+
+    $hash_value = implode('', $data);
+    $hash_value = $hash_value.$salt;
+    
+    $SHAval = hash('sha256', $hash_value);
+
+    if ($cs_keyvalue[0] == $SHAval) {
+      return TRUE;
+    }
+    return FALSE;
+  }
+
+  /**
+   * Processes PhonePe Process Payment.
+   *
+   * @return string|bool $string_or_boolean
+   */
+  function processPhonePePayment(array $data, Payment $payment) {
+    $payment->setStatus(new PaymentStatusItem($this->convertStatus($data['code'])));
+    entity_save('payment', $payment);
+    module_invoke_all('phonepe_process_payment', $data, $payment);
+    $payment->finish();
+  }
+
+}