Sunday, July 1, 2012

Integration with Paypal on PHP

This post will teach you how to to integrate your website with paypal and hope I was able to guide you well.

To start with, you need to apply for a Paypal account. If you just want a test account, you can register for a sandbox account - http://www.sandbox.paypal.com

We need the following account details below:
  • Username
  • Password
  • API Signature
Once you have all the details, we can now do the coding part. Aside from account details, you also need to know the endpoint url and the paypal callback url. Please see details below.

Live:
  • Endpoint - https://api-3t.paypal.com/nvp
  • Callback - https://www.paypal.com/webscr&cmd=_express-checkout&token=
Sandbox:
  • Endpoint - https://api-3t.sandbox.paypal.com/nvp
  • Callback - https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=
Just to get us going, please see below code snippet for checking the environment and initiate the details.

// set up your environment - live or sandbox
$live = "true";

if ($live == "true") {
        // live account details
        $username = 'paypal live username';
        $password = 'paypal live password';
        $signature = 'paypal live api signature';
        $endpoint = "https://api-3t.paypal.com/nvp";
        $url = "https://www.paypal.com/webscr&cmd=_express-checkout&token=";
} else {
        // sandbox account details
        $username = 'paypal sandbox username';
        $password = 'paypal sandbox password';
        $signature = 'paypal sandbox api signature';
        $endpoint = "https://api-3t.sandbox.paypal.com/nvp";
        $url = "https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=";
}

Next, we need the details of transaction to be submitted to paypal api. For the benefit of this post, please see details below.

$itemamt = '40.00'; // item amount
$paymentamt = '50.00'; // total amount
$taxamt = '10.00'; // tax amount
$currencyid = 'CAD'; // 'GBP', 'EUR', 'JPY', 'USD', 'AUD'

Please make sure that $paymentamt = $itemamt + $taxamt

Also, we need the details below to perform payment transaction.

$startdate = urlencode('2012-07-01T18:10:40+08:00'); // payment start date
$billingfreq = '1' // number of months interval;
$paymenttype = 'Authorization'; // or 'Sale' or 'Order'
$description = urlencode('sample description'); // description of transaction

You also need to define your callback url. Please see below.

$returnurl = 'http://www.domain.com/callback/return.html'; // callback url for successful transaction
$cancelurl = 'http://www.domain.com/callback/cancel.html'; // callback url for failed transaction

After defining the parameters, compose the query string. Please see below.

$reqStr = "METHOD=SetExpressCheckout&VERSION=65.2&PWD=$password&USER=$username&SIGNATURE=$signature&RETURNURL=$returnurl&CANCELURL=$cancelurl&REQCONFIRMSHIPPING=0&NOSHIPPING=1&PAYMENTREQUEST_0_CURRENCYCODE=$currencyid&PAYMENTREQUEST_0_AMT=$paymentamt&PAYMENTREQUEST_0_ITEMAMT=$itemamt&PAYMENTREQUEST_0_TAXAMT=$taxamt&PAYMENTREQUEST_0_DESC=$description&PAYMENTREQUEST_0_PAYMENTACTION=$paymenttype&L_PAYMENTREQUEST_0_ITEMCATEGORY0=Digital&L_PAYMENTREQUEST_0_NAME0=$description&L_PAYMENTREQUEST_0_QTY0=1&L_PAYMENTREQUEST_0_AMT0=$itemamt&L_PAYMENTREQUEST_0_DESC0=$description&L_BILLINGAGREEMENTDESCRIPTION0=$description&L_BILLINGTYPE0=RecurringPayments&MAXFAILEDPAYMENTS='true'";

Setup the curl as below.

// set the curl parameters.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $endpoint);
curl_setopt($ch, CURLOPT_VERBOSE, 1);

// disable ssl verification
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

// set the method
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);

// set the post parameters
curl_setopt($ch, CURLOPT_POSTFIELDS, $reqstr);
               
// execute curl
$response = curl_exec($ch);
if (!$response) exit("SetExpressCheckout failed: ".curl_error($ch).'('.curl_errno($ch).')');

Get and parse the http response.

// get and parse the response
$arr_response = explode("&", $response);

$http_response = array();
foreach ($arr_response as $key => $val) {
        $param = explode("=", $val);
        if (sizeof($param) > 1) $http_response[$param[0]] = $param[1];
}

if ((sizeof($http_response) == 0) || !array_key_exists('ACK', $http_response)) {
        exit("SetExpressCheckout failed: " . print_r($arr_response, true));
}

Get the token and pass it to paypal for processing.

// get the token and pass to paypal for processing
if (strtoupper($http_response["ACK"]) == "SUCCESS" || strtoupper($httpParsedResponseAr["ACK"]) == "SUCCESSWITHWARNING") {
        // redirect to paypal to confirm and process transaction
        $token = urldecode($http_response["TOKEN"]);
        $paypalurl .= $token;

        if (isset($paypalurl)) redirect($paypalurl);
        exit;
} else  {
        exit('SetExpressCheckout failed: ' . print_r($http_response, true));
}

This is all for now. Next post will be processing after Paypal. You can also check out the full script below. Happy coding!!

<?php

// set up your environment - live or sandbox
$live = "true";

if ($live == "true") {
        // live account details
        $username = 'paypal live username';
        $password = 'paypal live password';
        $signature = 'paypal live api signature';
        $endpoint = "https://api-3t.paypal.com/nvp";
        $url = "https://www.paypal.com/webscr&cmd=_express-checkout&token=";
} else {
        // sandbox account details
        $username = 'paypal sandbox username';
        $password = 'paypal sandbox password';
        $signature = 'paypal sandbox api signature';
        $endpoint = "https://api-3t.sandbox.paypal.com/nvp";
        $url = "https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=";
}

$itemamt = '40.00'; // item amount
$paymentamt = '50.00'; // total amount
$taxamt = '10.00'; // tax amount
$currencyid = 'CAD'; // or 'GBP', 'EUR', 'JPY', 'USD', 'AUD'

$startdate = urlencode('2012-07-01T18:10:40+08:00'); // payment start date - 2012-07-01T18:10:40+08:00
$billingfreq = '1' // number of months interval;
$paymenttype = 'Authorization'; // or 'Sale' or 'Order'
$description = urlencode('sample description'); // description of transaction

$returnurl = 'http://www.domain.com/callback/return.html'; // callback url for successful transaction
$cancelurl = 'http://www.domain.com/callback/cancel.html'; // callback url for failed transaction

$reqstr = "METHOD=SetExpressCheckout&VERSION=65.2&PWD=$password&USER=$username&SIGNATURE=$signature&RETURNURL=$returnurl&CANCELURL=$cancelurl&REQCONFIRMSHIPPING=0&NOSHIPPING=1&PAYMENTREQUEST_0_CURRENCYCODE=$currencyid&PAYMENTREQUEST_0_AMT=$paymentamt&PAYMENTREQUEST_0_ITEMAMT=$itemamt&PAYMENTREQUEST_0_TAXAMT=$taxamt&PAYMENTREQUEST_0_DESC=$description&PAYMENTREQUEST_0_PAYMENTACTION=$paymenttype&L_PAYMENTREQUEST_0_ITEMCATEGORY0=Digital&L_PAYMENTREQUEST_0_NAME0=$description&L_PAYMENTREQUEST_0_QTY0=1&L_PAYMENTREQUEST_0_AMT0=$itemamt&L_PAYMENTREQUEST_0_DESC0=$description&L_BILLINGAGREEMENTDESCRIPTION0=$description&L_BILLINGTYPE0=RecurringPayments&MAXFAILEDPAYMENTS='true'";

// set the curl parameters.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $endpoint);
curl_setopt($ch, CURLOPT_VERBOSE, 1);

// disable ssl verification
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

// set the method
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);

// set the post parameters
curl_setopt($ch, CURLOPT_POSTFIELDS, $reqstr);

// execute curl
$response = curl_exec($ch);

if (!$response) exit("SetExpressCheckout failed: ".curl_error($ch).'('.curl_errno($ch).')');

// get and parse the response
$arr_response = explode("&", $response);

$http_response = array();
foreach ($arr_response as $key => $val) {
        $param = explode("=", $val);
        if (sizeof($param) > 1) $http_response[$param[0]] = $param[1];
}

if ((sizeof($http_response) == 0) || !array_key_exists('ACK', $http_response)) {
        exit("SetExpressCheckout failed: " . print_r($arr_response, true));
}

// get the token and pass to paypal for processing
if (strtoupper($http_response["ACK"]) == "SUCCESS" || strtoupper($httpParsedResponseAr["ACK"]) == "SUCCESSWITHWARNING") {
        // redirect to paypal to confirm and process transaction
        $token = urldecode($http_response["TOKEN"]);
        $paypalurl .= $token;

        if (isset($paypalurl)) redirect($paypalurl);
        exit;
} else  {
        exit('SetExpressCheckout failed: ' . print_r($http_response, true));
}

?>
Posted by Unknown at 7:45 PM
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