PHP, Symfony, Mysql, jQuery, Ajax, Web development, Payment Gateways, CCavenue, Interview Questions, Web Service IntegrationsPaypal Payments Using cURL
Pre-requisites:
-cURL
-Paypal Account with API keys and such
vendors/paypal/Paypal.php
-cURL
-Paypal Account with API keys and such
vendors/paypal/Paypal.php
<?php
/***********************************************************
This File Sets Up Calls to Paypal by arranging url information.
***********************************************************/
class Paypal{
function __construct(){
}
function DoDirectPayment($paymentInfo=array()){
/**
* Get required parameters from the web form for the request
*/
$paymentType =urlencode('Sale');
$firstName =urlencode($paymentInfo['Member']['first_name']);
$lastName =urlencode($paymentInfo['Member']['last_name']);
$creditCardType =urlencode($paymentInfo['CreditCard']['credit_type']);
$creditCardNumber = urlencode($paymentInfo['CreditCard']['card_number']);
$expDateMonth =urlencode($paymentInfo['CreditCard']['expiration_month']);
$padDateMonth = str_pad($expDateMonth, 2, '0', STR_PAD_LEFT);
$expDateYear =urlencode($paymentInfo['CreditCard']['expiration_year']);
$cvv2Number = urlencode($paymentInfo['CreditCard']['cv_code']);
$address1 = urlencode($paymentInfo['Member']['billing_address']);
$address2 = urlencode($paymentInfo['Member']['billing_address2']);
$country = urlencode($paymentInfo['Member']['billing_country']);
$city = urlencode($paymentInfo['Member']['billing_city']);
$state =urlencode($paymentInfo['Member']['billing_state']);
$zip = urlencode($paymentInfo['Member']['billing_zip']);
$amount = urlencode($paymentInfo['Order']['theTotal']);
$currencyCode="USD";
$paymentType=urlencode('Sale');
$ip=$_SERVER['REMOTE_ADDR'];
/* Construct the request string that will be sent to PayPal.
The variable $nvpstr contains all the variables and is a
name value pair string with & as a delimiter */
$nvpstr="&PAYMENTACTION=Sale&IPADDRESS=$ip&AMT=$amount&CREDITCARDTYPE=$creditCardType&ACCT=$creditCardNumber&EXPDATE=".$padDateMonth.$expDateYear."&CVV2=$cvv2Number&FIRSTNAME=$firstName&LASTNAME=$lastName&STREET=$address1&STREET2=$address2&CITYNAME=$city&STATEORPROVINCE=$state".
"&POSTALCODE=$zip&COUNTRY=$country&CURRENCYCODE=$currencyCode";
/* Make the API call to PayPal, using API signature.
The API response is stored in an associative array called $resArray */
$resArray=$this->hash_call("doDirectPayment",$nvpstr);
/* Display the API response back to the browser.
If the response from PayPal was a success, display the response parameters'
If the response was an error, display the errors received using APIError.php.
*/
return $resArray;
//Contains 'TRANSACTIONID,AMT,AVSCODE,CVV2MATCH, Or Error Codes'
}
function SetExpressCheckout($paymentInfo=array()){
$amount = urlencode($paymentInfo['Order']['theTotal']);
$paymentType=urlencode('Sale');
$currencyCode=urlencode('USD');
$returnURL =urlencode($paymentInfo['Order']['returnUrl']);
$cancelURL =urlencode($paymentInfo['Order']['cancelUrl']);
$nvpstr='&AMT='.$amount.'&PAYMENTACTION='.$paymentType.'&CURRENCYCODE='.$currencyCode.'&RETURNURL='.$returnURL.'&CANCELURL='.$cancelURL;
$resArray=$this->hash_call("SetExpressCheckout",$nvpstr);
return $resArray;
}
function GetExpressCheckoutDetails($token){
$nvpstr='&TOKEN='.$token;
$resArray=$this->hash_call("GetExpressCheckoutDetails",$nvpstr);
return $resArray;
}
function DoExpressCheckoutPayment($paymentInfo=array()){
$paymentType='Sale';
$currencyCode='USD';
$serverName = $_SERVER['SERVER_NAME'];
$nvpstr='&TOKEN='.urlencode($paymentInfo['TOKEN']).'&PAYERID='.urlencode($paymentInfo['PAYERID']).'&PAYMENTACTION='.urlencode($paymentType).'&AMT='.urlencode($paymentInfo['ORDERTOTAL']).'&CURRENCYCODE='.urlencode($currencyCode).'&IPADDRESS='.urlencode($serverName);
$resArray=$this->hash_call("DoExpressCheckoutPayment",$nvpstr);
return $resArray;
}
function APIError($errorNo,$errorMsg,$resArray){
$resArray['Error']['Number']=$errorNo;
$resArray['Error']['Number']=$errorMsg;
return $resArray;
}
function hash_call($methodName,$nvpStr)
{
require_once 'constants.php';
$API_UserName=API_USERNAME;
$API_Password=API_PASSWORD;
$API_Signature=API_SIGNATURE;
$API_Endpoint =API_ENDPOINT;
$version=VERSION;
//setting the curl parameters.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$API_Endpoint);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
//turning off the server and peer verification(TrustManager Concept).
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POST, 1);
//if USE_PROXY constant set to TRUE in Constants.php, then only proxy will be enabled.
//Set proxy name to PROXY_HOST and port number to PROXY_PORT in constants.php
if(USE_PROXY)
curl_setopt ($ch, CURLOPT_PROXY, PROXY_HOST.":".PROXY_PORT);
//NVPRequest for submitting to server
$nvpreq="METHOD=".urlencode($methodName)."&VERSION=".urlencode($version)."&PWD=".urlencode($API_Password)."&USER=".urlencode($API_UserName)."&SIGNATURE=".urlencode($API_Signature).$nvpStr;
//setting the nvpreq as POST FIELD to curl
curl_setopt($ch,CURLOPT_POSTFIELDS,$nvpreq);
//getting response from server
$response = curl_exec($ch);
//convrting NVPResponse to an Associative Array
$nvpResArray=$this->deformatNVP($response);
$nvpReqArray=$this->deformatNVP($nvpreq);
if (curl_errno($ch))
$nvpResArray = $this->APIError(curl_errno($ch),curl_error($ch),$nvpResArray);
else
curl_close($ch);
return $nvpResArray;
}
/** This function will take NVPString and convert it to an Associative Array and it will decode the response.
* It is usefull to search for a particular key and displaying arrays.
* @nvpstr is NVPString.
* @nvpArray is Associative Array.
*/
function deformatNVP($nvpstr)
{
$intial=0;
$nvpArray = array();
while(strlen($nvpstr)){
//postion of Key
$keypos= strpos($nvpstr,'=');
//position of value
$valuepos = strpos($nvpstr,'&') ? strpos($nvpstr,'&'): strlen($nvpstr);
/*getting the Key and Value values and storing in a Associative Array*/
$keyval=substr($nvpstr,$intial,$keypos);
$valval=substr($nvpstr,$keypos+1,$valuepos-$keypos-1);
//decoding the respose
$nvpArray[urldecode($keyval)] =urldecode( $valval);
$nvpstr=substr($nvpstr,$valuepos+1,strlen($nvpstr));
}
return $nvpArray;
}
}
?>
<?php
/****************************************************
constants.php
This is the configuration file for the samples.This file
defines the parameters needed to make an API call.
****************************************************/
/**
# API user: The user that is identified as making the call. you can
# also use your own API username that you created on PayPal̢۪s sandbox
# or the PayPal live site
*/
define('API_USERNAME', 'YOUR USERNAME HERE');
/**
# API_password: The password associated with the API user
# If you are using your own API username, enter the API password that
# was generated by PayPal below
# IMPORTANT - HAVING YOUR API PASSWORD INCLUDED IN THE MANNER IS NOT
# SECURE, AND ITS ONLY BEING SHOWN THIS WAY FOR TESTING PURPOSES
*/
define('API_PASSWORD', 'YOU PASS HERE');
/**
# API_Signature:The Signature associated with the API user. which is generated by paypal.
*/
define('API_SIGNATURE', 'YOU SIG HERE');
/**
# Endpoint: this is the server URL which you have to connect for submitting your API request.
*/
define('API_ENDPOINT', 'https://api-3t.paypal.com/nvp');
/**
USE_PROXY: Set this variable to TRUE to route all the API requests through proxy.
like define('USE_PROXY',TRUE);
*/
define('USE_PROXY',FALSE);
/**
PROXY_HOST: Set the host name or the IP address of proxy server.
PROXY_PORT: Set proxy port.
PROXY_HOST and PROXY_PORT will be read only if USE_PROXY is set to TRUE
*/
define('PROXY_HOST', '127.0.0.1');
define('PROXY_PORT', '808');
/* Define the PayPal URL. This is the URL that the buyer is
first sent to to authorize payment with their paypal account
change the URL depending if you are testing on the sandbox
or going to the live PayPal site
For the sandbox, the URL is
https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=
For the live site, the URL is
https://www.paypal.com/webscr&cmd=_express-checkout&token=
*/
define('PAYPAL_URL', 'https://www.paypal.com/webscr&cmd=_express-checkout&token=');
/**
# Version: this is the API version in the request.
# It is a mandatory parameter for each API request.
# The only supported value at this time is 2.3
*/
define('VERSION', '3.0');
?>
components/paypal.php
Component Class:
<?php
<?php
/**
* Paypal Direct Payment API Component class file.
*/
App::import('Vendor','paypal' ,array('file'=>'paypal/Paypal.php'));
class PaypalComponent extends Object{
function processPayment($paymentInfo,$function){
$paypal = new Paypal();
if ($function=="DoDirectPayment")
return $paypal->DoDirectPayment($paymentInfo);
elseif ($function=="SetExpressCheckout")
return $paypal->SetExpressCheckout($paymentInfo);
elseif ($function=="GetExpressCheckoutDetails")
return $paypal->GetExpressCheckoutDetails($paymentInfo);
elseif ($function=="DoExpressCheckoutPayment")
return $paypal->DoExpressCheckoutPayment($paymentInfo);
else
return "Function Does Not Exist!";
}
}
?>
?>
sample direct payment controller function:
Controller Class:
<?php
function processPayment(){
$paymentInfo = array('Member'=>
array(
'first_name'=>'name_here',
'last_name'=>'lastName_here',
'billing_address'=>'address_here',
'billing_address2'=>'address2_here',
'billing_country'=>'country_here',
'billing_city'=>'city_here',
'billing_state'=>'state_here',
'billing_zip'=>'zip_here'
),
'CreditCard'=>
array(
'card_number'=>'number_here',
'expiration_month'=>'month_here',
'expiration_year'=>'year_here',
'cv_code'=>'code_here'
),
'Order'=>
array('theTotal'=>1.00)
);
/*
* On Success, $result contains [AMT] [CURRENCYCODE] [AVSCODE] [CVV2MATCH]
* [TRANSACTIONID] [TIMESTAMP] [CORRELATIONID] [ACK] [VERSION] [BUILD]
*
* On Fail, $ result contains [AMT] [CURRENCYCODE] [TIMESTAMP] [CORRELATIONID]
* [ACK] [VERSION] [BUILD] [L_ERRORCODE0] [L_SHORTMESSAGE0] [L_LONGMESSAGE0]
* [L_SEVERITYCODE0]
*
* Success or Failure is best tested using [ACK].
* ACK will either be "Success" or "Failure"
*/
$result = $this->Paypal->processPayment($paymentInfo,"DoDirectPayment");
$ack = strtoupper($result["ACK"]);
if($ack!="SUCCESS")
$error = $result['L_LONGMESSAGE0'];
else{
/* successful do something here! */
}
}
?>
Express Checkout Controller Example
Controller Class:
<?php
function _get($var) {
return isset($this->params['url'][$var])? $this->params['url'][$var]: null;
}
function expressCheckout($step=1){
$this->Ssl->force();
$this->set('step',$step);
//first get a token
if ($step==1){
// set
$paymentInfo['Order']['theTotal']= .01;
$paymentInfo['Order']['returnUrl']= "https://fullPathHere/orders/expressCheckout/2/";
$paymentInfo['Order']['cancelUrl']= "https://fullPathToCancelUrl";
// call paypal
$result = $this->Paypal->processPayment($paymentInfo,"SetExpressCheckout");
$ack = strtoupper($result["ACK"]);
//Detect Errors
if($ack!="SUCCESS")
$error = $result['L_LONGMESSAGE0'];
else {
// send user to paypal
$token = urldecode($result["TOKEN"]);
$payPalURL = PAYPAL_URL.$token;
$this->redirect($payPalURL);
}
}
//next have the user confirm
elseif($step==2){
//we now have the payer id and token, using the token we should get the shipping address
//of the payer. Compile all the info into the session then set for the view.
//Add the order total also
$result = $this->Paypal->processPayment($this->_get('token'),"GetExpressCheckoutDetails");
$result['PAYERID'] = $this->_get('PayerID');
$result['TOKEN'] = $this->_get('token');
$result['ORDERTOTAL'] = .01;
$ack = strtoupper($result["ACK"]);
//Detect errors
if($ack!="SUCCESS"){
$error = $result['L_LONGMESSAGE0'];
$this->set('error',$error);
}
else {
$this->set('result',$this->Session->read('result'));
$this->Session->write('result',$result);
/*
* Result at this point contains the below fields. This will be the result passed
* in Step 3. I used a session, but I suppose one could just use a hidden field
* in the view:[TOKEN] [TIMESTAMP] [CORRELATIONID] [ACK] [VERSION] [BUILD] [EMAIL] [PAYERID]
* [PAYERSTATUS] [FIRSTNAME][LASTNAME] [COUNTRYCODE] [SHIPTONAME] [SHIPTOSTREET]
* [SHIPTOCITY] [SHIPTOSTATE] [SHIPTOZIP] [SHIPTOCOUNTRYCODE] [SHIPTOCOUNTRYNAME]
* [ADDRESSSTATUS] [ORDERTOTAL]
*/
}
}
//show the confirmation
elseif($step==3){
$result = $this->Paypal->processPayment($this->Session->read('result'),"DoExpressCheckoutPayment");
//Detect errors
$ack = strtoupper($result["ACK"]);
if($ack!="SUCCESS"){
$error = $result['L_LONGMESSAGE0'];
$this->set('error',$error);
}
else {
$this->set('result',$this->Session->read('result'));
}
}
}
?>
Express Checkout View: express_checkout.ctp
View Template:
<?php
if (!isset($error)){
if ($step==2){
echo $form->create('Order',array('type' => 'post', 'action' => 'expressCheckout/3', 'id' => 'OrderExpressCheckoutConfirmation'));
//all shipping info contained in $result display it here and ask user to confirm.
//echo pr($result);
echo $form->end('Confirm Payment');
}
if ($step==3){
//show confirmation once again all information is contained in $result or $error
echo '<h2>Congrats</h2>';
}
}
else
echo $error;
?> 
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