One of the most widely used payment processing platforms nowadays is Paypal. Andrew Angell shows you how to process credit cards directly with PayPal’s API using Payments Pro web service API’s.

Step 1: Setup Directory Structure

Create basic structure. It has 2 files and configuration is stored in config.php and handle the processing code in process-credit-card.php.

Step 2: Setup Config File

// Set sandbox (test mode) to true/false.

$sandbox = TRUE;

 // Set PayPal API version and credentials.

$api_version = '85.0';

$api_endpoint = $sandbox ? 'https://api-3t.sandbox.paypal.com/nvp' : 'https://api-3t.paypal.com/nvp';

$api_username = $sandbox ? 'SANDBOX_USERNAME_GOES_HERE' : 'LIVE_USERNAME_GOES_HERE';

$api_password = $sandbox ? 'SANDBOX_PASSWORD_GOES_HERE' : 'LIVE_PASSWORD_GOES_HERE';

$api_signature = $sandbox ? 'SANDBOX_SIGNATURE_GOES_HERE' : 'LIVE_SIGNATURE_GOES_HERE';

Step 3: Create API Request

Start creating process-credit-card.php page.

// Include config file

require_once('includes/config.php');

Create name-value-pair string.

PARAM1=value1&PARAM2=value2&PARAM3=value3…etc.

Store following parameters by default:

• METHOD – The name of the API call you’re making.
• USER – The API username
• PWD – The API password
• SIGNATURE – The API signature
• VERSION – The API version

// Store request params in an array

$request_params = array

(

'METHOD' => 'DoDirectPayment',

'USER' => $api_username,

'PWD' => $api_password,

'SIGNATURE' => $api_signature,

'VERSION' => $api_version,

'PAYMENTACTION' => 'Sale',

'IPADDRESS' => $_SERVER['REMOTE_ADDR'],

'CREDITCARDTYPE' => 'MasterCard',

'ACCT' => '5522340006063638',

'EXPDATE' => '022013',

'CVV2' => '456',

'FIRSTNAME' => 'Tester',

'LASTNAME' => 'Testerson',

'STREET' => '707 W. Bay Drive',

'CITY' => 'Largo',

'STATE' => 'FL',

'COUNTRYCODE' => 'US',

'ZIP' => '33770',

'AMT' => '100.00',

'CURRENCYCODE' => 'USD',

'DESC' => 'Testing Payments Pro'

);

Loop through this to generate NVP string.

// Loop through $request_params array to generate the NVP string.

$nvp_string = '';

foreach($request_params as $var=>$val)

{

$nvp_string .= '&'.$var.'='.urlencode($val);

}

Value of $nvp_string will become:

METHOD=DoDirectPayment&USER=sandbo*****e.com&PWD=12***74&SIGNATURE=AiKZ******6W18v&VERSION=85.0&PAYMENTACTION=Sale&IPADDRESS=72.135.111.9&CREDITCARDTYPE=MasterCard&ACCT=5522340006063638&EXPDATE=022013&CVV2=456&FIRSTNAME=Tester&LASTNAME=Testerson&STREET=707+W.+Bay+Drive&CITY=Largo&STATE=FL&COUNTRYCODE=US&ZIP=33770&AMT=100.00&CURRENCYCODE=USD&DESC=Testing+Payments+Pro

This string is what we need in sending to Paypal for our request.

Step 4: Send HTTP Request to Paypal

Use PHP’s CURL methods.

// Send NVP string to PayPal and store response

$curl = curl_init();

curl_setopt($curl, CURLOPT_VERBOSE, 1);

curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);

curl_setopt($curl, CURLOPT_TIMEOUT, 30);

curl_setopt($curl, CURLOPT_URL, $api_endpoint);

curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($curl, CURLOPT_POSTFIELDS, $nvp_string);

$result = curl_exec($curl);

curl_close($curl);

Step 5: Parse API Response

Running the script that will get a successful response back looks like this:

TIMESTAMP=2012%2d04%2d16T07%3a59%3a36Z&CORRELATIONID=9eb40cd84a7d3&ACK=Success&VERSION=85%2e0&BUILD=2764190&AMT=100%2e00&CURRENCYCODE=USD&AVSCODE=X&CVV2MATCH=M&TRANSACTIONID=160896645A8111040

 

Additional Data Parsing Option

Angell used this following function to convert PayPal response to an array.

// Function to convert NTP string to an array

function NVPToArray($NVPString)

{

$proArray = array();

while(strlen($NVPString))

{

// name

$keypos= strpos($NVPString,'=');

$keyval = substr($NVPString,0,$keypos);

// value

$valuepos = strpos($NVPString,'&') ? strpos($NVPString,'&'): strlen($NVPString);

$valval = substr($NVPString,$keypos+1,$valuepos-$keypos-1);

// decoding the respose

$proArray[$keyval] = urldecode($valval);

$NVPString = substr($NVPString,$valuepos+1,strlen($NVPString));

}

return $proArray;

}

You can check out the full tutorial by clicking on the image.

Download the source file HERE.

 

Incoming search terms for the article:

• how to process credit cards with paypal payments pro using php
• SANDBOX_SIGNATURE_GOES_HERE
• free api code for credit card payment processing using php
• paypal website payments pro test credit card script
• paypal pro processing script
• php credit card processing in pdf
• paypal credit card payment script in php
• paypal generate credit card form php
• paypal pro nvp example cakephp plugin
• paypal pro get php example