How to retrieve PayPal JSON Transaction Details using PHP Curl

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I have a class called PayPal Express which is Handling API URL Requests for retrieving results such as the ClientID, Secret and PayPal Base URL are already set this class called config.php

define('PRO_PayPal', 0);

// Configuration for Live Paypal Transactions
if(PRO_PayPal){
    define("PayPal_CLIENT_ID", "#########################");
    define("PayPal_SECRET", "###################");
    define("PayPal_BASE_URL", "https://api.paypal.com/v1/");
}

// configurations for sandbox Transactions
else{
    define("PayPal_CLIENT_ID", "ATDV3X3ftdxIDC97H99-XgtTca7cpMsyPDtOrxuGKSMYzphNivsu8YFFWTVkRK5CnXbr93BY9liDNAeY");
    define("PayPal_SECRET", "EPFvBgOjceLpCmoCKKrsXEFzcR4OtJh4hDimKoobA5Md3qpJGrByUgxh6leUMqzwrxrp_BwR8fXP9Vv3");
    define("PayPal_BASE_URL", "https://api-m.sandbox.paypal.com/v1/");
}

The PayPal Express Class

 require 'Config.php';

 class PaypalExpress{ 
    
       
      public $paypalClientID  = PayPal_CLIENT_ID;
      public $paypalSecret   = PayPal_SECRET; 
     
      public function validate($paymentRef, $paymentToken, $payerID, $productID){ 
        
        $ch = curl_init(); 
        curl_setopt($ch, CURLOPT_URL, PayPal_BASE_URL.'oauth2/token'); 
        curl_setopt($ch, CURLOPT_HEADER, false); 
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); 
        curl_setopt($ch, CURLOPT_POST, true); 
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
        curl_setopt($ch, CURLOPT_USERPWD, $this->paypalClientID.":".$this->paypalSecret); 
        curl_setopt($ch, CURLOPT_POSTFIELDS, "grant_type=client_credentials"); 
        $response = curl_exec($ch); 
        curl_close($ch); 
         
        if(empty($response)) die("Error:No response from paypal");

        else{ 

            $jsonData = json_decode($response); 
            $curl = curl_init(PayPal_BASE_URL.'payments/payment/'.$paymentRef); 
            curl_setopt($curl, CURLOPT_POST, false); 
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); 
            curl_setopt($curl, CURLOPT_HEADER, false); 
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); 
            curl_setopt($curl, CURLOPT_HTTPHEADER, array( 

                'Authorization: Bearer ' . $jsonData->access_token, 
                'Accept: application/json', 
                'Content-Type: application/xml' 
            )); 
            
            $response = curl_exec($curl); 
            curl_close($curl); 
             
            // Transaction data 
            $result = json_decode($response); 
             
            return $result; 
        } 
     
    } 
}

I have this Process.php page which gets the Returned URL data from PayPal and it is supposed to insert into the database the verified payment details

    require 'config.php';
    require 'session.php';
    require 'class/paypalExpress.php';
    require 'class/property.php';
    require 'class/payment.php';

    try {

       
    if(!empty($_GET['paymentRef']) && !empty($_GET['payerID']) && !empty($_GET['token']) && !empty($_GET['propid']) ){
       
        $paymentRef = $_GET['paymentRef'];
        $payerID = $_GET['payerID'];
        $token = $_GET['token'];
        $propid = $_GET['propid'];

        $payment = new payment();
        $property = new property();
        $paypalExpress = new paypalExpress();

        $newId = $property->getProperty($propid);

      $Check=$paypalExpress->validate($paymentRef, $propid, $payerID, $token);


            if(isset($Check) && $Check->state == 'approved')

            {
               
               $id = $Check->id; 
               $state = $Check->state; 
               $payerFirstName = $Check->payer->payer_info->first_name; 
               $payerLastName = $Check->payer->payer_info->last_name; 
               $payerName = $payerFirstName.' '.$payerLastName; 
               $payerEmail = $Check->payer->payer_info->email; 
               $payerID = $Check->payer->payer_info->payer_id; 
               $payerCountryCode = $Check->payer->payer_info->country_code; 
               $paidAmount = $Check->transactions[0]->amount->details->subtotal; 
               $currency = $Check->transactions[0]->amount->currency;


                if($newId->Price == $paidAmount && $newId->Currency == $currency)
               {

                    $newpayment = $payment->updatePayments($propid,$paymentRef,$payerID,$token);

                    // redirecting information to reciept page                      
                    header("Location:Reciept.php?pyfname=$payerFirstName&pylname=$payerLastName&pymail=$payerEmail"); 

                }

            }
           
    }
    else{

        header('Location:index.php'); // redirecting users if there is no transaction details on the url
   }

    } catch (PDOException $th) {
        echo "Error : " .$th->getMessage();
    }

Now when the transaction is done and Paypal redirects the ransaction details to Process.php, instead of inserting the payment details i am just getting a blank page with transaction details from Paypal on the URL. Is there something i am missing on the code?

php
1 Answers

Thanks for the Code! Ive been trying to figure out how to complete paypal server side integration for several weeks! Your code works if you move the paypal credentials from your configuration.php to your paypalExpress.php

    <?php //confiuration.php
    define('PRO_PayPal', 0);
    // define("PayPal_CLIENT_ID", "#########################");
    //  define("PayPal_SECRET", "'###################");
    define("PayPal_BASE_URL", "https://api-m.paypal.com/v1/");
    //////////////////////////////////////////////////////////

    <?php //paypalExpress.php
    require 'configuration.php';
    class PaypalExpress{ 

    //public $paypalClientID  = '#########################'; // SANDBOX
    // public $paypalSecret   = '#########################'; // SANDBOX

    public $paypalClientID  = '#########################'; // LIVE
    public $paypalSecret   = '#########################';  // LIVE
 
    public function validate($paymentRef, $paymentToken, $payerID, $productID){ 
    
    $ch = curl_init(); 
    curl_setopt($ch, CURLOPT_URL, PayPal_BASE_URL.'oauth2/token'); 
    curl_setopt($ch, CURLOPT_HEADER, false); 
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); 
    curl_setopt($ch, CURLOPT_POST, true); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    curl_setopt($ch, CURLOPT_USERPWD, $this->paypalClientID.":".$this->paypalSecret); 
    curl_setopt($ch, CURLOPT_POSTFIELDS, "grant_type=client_credentials"); 
    curl_setopt($ch, CURLOPT_FAILONERROR,true);
    $response = curl_exec($ch); 
    curl_close($ch); 
   
    /*
    // Configuration for Live Paypal Transactions
    if(PRO_PayPal){
    define("PayPal_CLIENT_ID", "#########################");
    define("PayPal_SECRET", "###################");
    define("PayPal_BASE_URL", "https://api.paypal.com/v1/");
    }
    // configurations for sandbox Transactions
    else{
    define
    ("PayPal_CLIENT_ID","ATDV3X3ftdxIDC97H99- 
    XgtTca7cpMsyPDtOrxuGKSMYzphNivsu8YFFWTVkRK5CnXbr93BY9liDNAeY");
    define       
    ("PayPal_SECRET","EPFvBgOjceLpCmoCKKrsXEFzcR4OtJh4
    hDimKoobA5Md3qpJGrByUgxh6leUMqzwrxrp_BwR8fXP9Vv3");
    define("PayPal_BASE_URL", "https://api-m.sandbox.paypal.com/v1/");
    }
    */
    ?>
user_166087250
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