internet sitesine kredi kartı ile ödeme sistemi nasıl eklenir?

 
  <?php 
  session_start(); 
  include "config.php"; 
  require_once('paypal.class.php');   
  $p = new paypal_class;              
  $p->paypal_url = 'https://www.paypal.com/cgi-bin/webscr';    
   
   
  $this_script = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF']; 
   
  if (empty($_GET['action'])) $_GET['action'] = 'process';   
   
  switch ($_GET['action']) { 
       
     case 'process':      
  	   
  	   
  	   
  	  if(isset($_SESSION['urunID'])) { 
  	   
  	  echo "<p><b><font size=2>Ödemenizi yapmanız üzere sizi paypal ödeme sayfamıza yönlendiriyoruz..<br><br>Lütfen Bekleyiniz</b></font></p>"; 
        echo '<br /><br /><img src="images/loading.gif" width="149" height="107">'; 
  	   
  	   
  	  $tutar = $_GET['tp']; 
  	  $urunAdi = "Deneme ürünüüü";	 
  	  $tarih = date("d-m-Y - H:i"); 
  	  $key = md5($tarih); 
  	  $_SESSION['key'] = $key; 
  	  
  	  $host = 'http://'.$_SERVER['HTTP_HOST']; 
        $p->add_field('business', 'info@deneme.com'); 
        $p->add_field('return', $host.'/odemeyapildi.html'); 
        $p->add_field('cancel_return', $host.'/odemeiptaledildi.html'); 
        $p->add_field('notify_url', $this_script.'?action=ipn'); 
        $p->add_field('item_name', $urunAdi); 
        $p->add_field('amount', $tutar); 
  	  $p->add_field('currency_code', 'TRY'); 
  	  $p->add_field('item_number',$key); 
         
   
        $p->submit_paypal_post(); 
        } else { 
  		echo "<p><b><font size=2> Ödeme Yapamazsınız ...<br><br>henüz ürün seçmediniz...</b></font></p>"; 
          echo '<br /><br /><img src="images/hata.jpg" width="149" height="107">'; 
  	  }	 
        break; 
         
     case 'success':          
   
  	  $PaymentStatus = $_POST['payment_status']; 
  	  $key = $_POST['item_number']; 
  	    
  	  
  	  if($PaymentStatus == 'Completed' && $_SESSION['key'] == $key ) { //Ödeme Başarılı ise yapılacak işlemler 
  	  $urunID = $_SESSION['urunID']; 
  	  mysql_query("UPDATE urunler SET aktif='1' where id='$urunID'");   
  	  unset($_SESSION['urunID']); 
  	  unset($_SESSION['key']); 
  		echo "<script>alert('Ödemeniz Başarılı Bir Şekilde Alındı !');</script><script>location.href=\"anasayfa\";</script>"; 
          echo '<br /><br /><img src="images/onay.jpg" width="149" height="107">'; 
  	  } else { 
  		echo "<script>alert('Ödeme İşleminiz Hatalı !');</script><script>location.href=\"anasayfa\";</script>"; 
          echo '<br /><br /><img src="images/hata.jpg" width="149" height="107">'; 
  		} 
        break; 
  	   
  	   
  	   
        case 'cancel': 
        echo "<br/><p><b>İşlem Sizin Tarafınızdan İptal Edilmiştir.</b></p><br />"; 
        echo '<br /><br /><img src="images/hata.jpg" width="149" height="107">'; 
  	  unset($_SESSION['urunID']); 
        break; 
   }      
    
   
  ?>

 
  <?php 
  /******************************************************************************* 
   *                      PHP Paypal IPN Integration Class 
   ******************************************************************************* 
   *      Author:     Micah Carrick 
   *      Email:      email@micahcarrick.com 
   *      Website:   http://www.micahcarrick.com 
   * 
   *      File:       paypal.class.php 
   *      Version:    1.3.0 
   *      Copyright:  (c) 2005 - Micah Carrick  
   *                  You are free to use, distribute, and modify this software  
   *                  under the terms of the GNU General Public License.  See the 
   *                  included license.txt file. 
   *       
   ******************************************************************************* 
   *  VERION HISTORY: 
   *      v1.3.0 [10.10.2005] - Fixed it so that single quotes are handled the  
   *                            right way rather than simple stripping them.  This 
   *                            was needed because the user could still put in 
   *                            quotes. 
   *   
   *      v1.2.1 [06.05.2005] - Fixed typo from previous fix :) 
   * 
   *      v1.2.0 [05.31.2005] - Added the optional ability to remove all quotes 
   *                            from the paypal posts.  The IPN will come back 
   *                            invalid sometimes when quotes are used in certian 
   *                            fields. 
   * 
   *      v1.1.0 [05.15.2005] - Revised the form output in the submit_paypal_post 
   *                            method to allow non-javascript capable browsers 
   *                            to provide a means of manual form submission. 
   * 
   *      v1.0.0 [04.16.2005] - Initial Version 
   * 
   ******************************************************************************* 
   *  DESCRIPTION: 
   * 
   *      NOTE: See www.micahcarrick.com for the most recent version of this class 
   *            along with any applicable sample files and other documentaion. 
   * 
   *      This file provides a neat and simple method to interface with paypal and 
   *      The paypal Instant Payment Notification (IPN) interface.  This file is 
   *      NOT intended to make the paypal integration "plug 'n' play". It still 
   *      requires the developer (that should be you) to understand the paypal 
   *      process and know the variables you want/need to pass to paypal to 
   *      achieve what you want.   
   * 
   *      This class handles the submission of an order to paypal aswell as the 
   *      processing an Instant Payment Notification. 
   *   
   *      This code is based on that of the php-toolkit from paypal.  I've taken 
   *      the basic principals and put it in to a class so that it is a little 
   *      easier--at least for me--to use.  The php-toolkit can be downloaded from 
   *     http://sourceforge.net/projects/paypal. 
   *       
   *      To submit an order to paypal, have your order form POST to a file with: 
   * 
   *          $p = new paypal_class; 
   *          $p->add_field('business', 'somebody@domain.com'); 
   *          $p->add_field('first_name', $_POST['first_name']); 
   *          ... (add all your fields in the same manor) 
   *          $p->submit_paypal_post(); 
   * 
   *      To process an IPN, have your IPN processing file contain: 
   * 
   *          $p = new paypal_class; 
   *          if ($p->validate_ipn()) { 
   *          ... (IPN is verified.  Details are in the ipn_data() array) 
   *          } 
   * 
   * 
   *      In case you are new to paypal, here is some information to help you: 
   * 
   *      1. Download and read the Merchant User Manual and Integration Guide from 
   *        http://www.paypal.com/en_US/pdf/integration_guide.pdf.  This gives  
   *         you all the information you need including the fields you can pass to 
   *         paypal (using add_field() with this class) aswell as all the fields 
   *         that are returned in an IPN post (stored in the ipn_data() array in 
   *         this class).  It also diagrams the entire transaction process. 
   * 
   *      2. Create a "sandbox" account for a buyer and a seller.  This is just 
   *         a test account(s) that allow you to test your site from both the  
   *         seller and buyer perspective.  The instructions for this is available 
   *         athttps://developer.paypal.com/ as well as a great forum where you 
   *         can ask all your paypal integration questions.  Make sure you follow 
   *         all the directions in setting up a sandbox test environment, including 
   *         the addition of fake bank accounts and credit cards. 
   *  
   ******************************************************************************* 
  */ 
   
  class paypal_class { 
       
     var $last_error;                 // holds the last error encountered 
      
     var $ipn_log;                    // bool: log IPN results to text file? 
      
     var $ipn_log_file;               // filename of the IPN log 
     var $ipn_response;               // holds the IPN response from paypal    
     var $ipn_data = array();         // array contains the POST values for IPN 
      
     var $fields = array();           // array holds the fields to submit to paypal 
   
      
     function paypal_class() { 
          
        // initialization constructor.  Called when class is created. 
         
        $this->paypal_url = 'https://www.sandbox.paypal.com/cgi-bin/webscr'; 
         
        $this->last_error = ''; 
         
        $this->ipn_log_file = '.ipn_results.log'; 
        $this->ipn_log = true;  
        $this->ipn_response = ''; 
                                                                   
        // populate $fields array with a few default values.  See the paypal 
        // documentation for a list of fields and their data types. These defaul 
        // values can be overwritten by the calling script. 
   
        $this->add_field('rm','2');           // Return method = POST 
        $this->add_field('cmd','_xclick');  
         
     } 
      
     function add_field($field, $value) { 
         
        // adds a key=>value pair to the fields array, which is what will be  
        // sent to paypal as POST variables.  If the value is already in the  
        // array, it will be overwritten. 
               
        $this->fields["$field"] = $value; 
     } 
   
     function submit_paypal_post() { 
    
        // this function actually generates an entire HTML page consisting of 
        // a form with hidden elements which is submitted to paypal via the  
        // BODY element's onLoad attribute.  We do this so that you can validate 
        // any POST vars from you custom form before submitting to paypal.  So  
        // basically, you'll have your own form which is submitted to your script 
        // to validate the data, which in turn calls this function to create 
        // another hidden form and submit to paypal. 
    
        // The user will briefly see a message on the screen that reads: 
        // "Please wait, your order is being processed..." and then immediately 
        // is redirected to paypal. 
   
        echo "<html>\n"; 
        echo "<head><title>Processing Payment...</title></head>\n"; 
        echo "<body onLoad=\"document.forms['paypal_form'].submit();\">\n"; 
     //   echo "<center><h2>Please wait, your order is being processed and you"; 
      //  echo " will be redirected to the paypal website.</h2></center>\n"; 
        echo "<form method=\"post\" name=\"paypal_form\" "; 
        echo "action=\"".$this->paypal_url."\">\n"; 
   
        foreach ($this->fields as $name => $value) { 
           echo "<input type=\"hidden\" name=\"$name\" value=\"$value\"/>\n"; 
        } 
        //echo "<center><br/><br/>If you are not automatically redirected to "; 
       // echo "paypal within 5 seconds...<br/><br/>\n"; 
       // echo "<input type=\"submit\" value=\"Click Here\"></center>\n"; 
         
        echo "</form>\n"; 
        echo "</body></html>\n"; 
       
     } 
      
     function validate_ipn() { 
   
        // parse the paypal URL 
        $url_parsed=parse_url($this->paypal_url);         
   
        // generate the post string from the _POST vars aswell as load the 
        // _POST vars into an arry so we can play with them from the calling 
        // script. 
        $post_string = '';     
        foreach ($_POST as $field=>$value) {  
           $this->ipn_data["$field"] = $value; 
           $post_string .= $field.'='.urlencode(stripslashes($value)).'&';  
        } 
        $post_string.="cmd=_notify-validate"; // append ipn command 
   
        // open the connection to paypal 
        $fp = fsockopen($url_parsed[host],"80",$err_num,$err_str,30);  
        if(!$fp) { 
             
           // could not open the connection.  If loggin is on, the error message 
           // will be in the log. 
           $this->last_error = "fsockopen error no. $errnum: $errstr"; 
           $this->log_ipn_results(false);        
           return false; 
            
        } else {  
    
           // Post the data back to paypal 
           fputs($fp, "POST $url_parsed[path] HTTP/1.1\r\n");  
           fputs($fp, "Host: $url_parsed[host]\r\n");  
           fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");  
           fputs($fp, "Content-length: ".strlen($post_string)."\r\n");  
           fputs($fp, "Connection: close\r\n\r\n");  
           fputs($fp, $post_string . "\r\n\r\n");  
   
           // loop through the response from the server and append to variable 
           while(!feof($fp)) {  
              $this->ipn_response .= fgets($fp, 1024);  
           }  
   
           fclose($fp); // close connection 
   
        } 
         
        if (eregi("VERIFIED",$this->ipn_response)) { 
     
           // Valid IPN transaction. 
           $this->log_ipn_results(true); 
           return true;        
            
        } else { 
     
           // Invalid IPN transaction.  Check the log for details. 
           $this->last_error = 'IPN Validation Failed.'; 
           $this->log_ipn_results(false);    
           return false; 
            
        } 
         
     } 
      
     function log_ipn_results($success) { 
          
        if (!$this->ipn_log) return;  // is logging turned off? 
         
        // Timestamp 
        $text = '['.date('m/d/Y g:i A').'] - ';  
         
        // Success or failure being logged? 
        if ($success) $text .= "SUCCESS!\n"; 
        else $text .= 'FAIL: '.$this->last_error."\n"; 
         
        // Log the POST variables 
        $text .= "IPN POST Vars from Paypal:\n"; 
        foreach ($this->ipn_data as $key=>$value) { 
           $text .= "$key=$value, "; 
        } 
    
        // Log the response from the paypal server 
        $text .= "\nIPN Response from Paypal Server:\n ".$this->ipn_response; 
         
        // Write to log 
        $fp=fopen($this->ipn_log_file,'a'); 
        fwrite($fp, $text . "\n\n");  
   
        fclose($fp);  // close file 
     } 
   
     function dump_fields() { 
    
        // Used for debugging, this function will output all the field/value pairs 
        // that are currently defined in the instance of the class using the 
        // add_field() function. 
         
        echo "<h3>paypal_class->dump_fields() Output:</h3>"; 
        echo "<table width=\"95%\" border=\"1\" cellpadding=\"2\" cellspacing=\"0\"> 
              <tr> 
                 <td bgcolor=\"black\"><b><font color=\"white\">Field Name</font></b></td> 
                 <td bgcolor=\"black\"><b><font color=\"white\">Value</font></b></td> 
              </tr>";  
         
        ksort($this->fields); 
        foreach ($this->fields as $key => $value) { 
           echo "<tr><td>$key</td><td>".urldecode($value)." </td></tr>"; 
        } 
    
        echo "</table><br>";  
     } 
  }          
   
  ?>