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CHAPTER 15 CREDIT CARD TRANSACTIONS
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2. Add the following at the end of the include/config.php file, modifying the constant data with the details of your Authorize.net account: // Constant definitions for authorize.net define('AUTHORIZE_NET_URL', 'https://test.authorize.net/gateway/transact.dll'); define('AUTHORIZE_NET_LOGIN_ID', '[Your Login ID]'); define('AUTHORIZE_NET_TRANSACTION_KEY', '[Your Transaction Key]'); define('AUTHORIZE_NET_TEST_REQUEST', 'FALSE'); 3. Add the following test_authorize_net.php test file in your site root folder: < php session_start(); if (empty ($_GET['step'])) { require_once 'include/config.php'; require_once BUSINESS_DIR . 'authorize_net_request.php'; $request = new AuthorizeNetRequest(AUTHORIZE_NET_URL); // Auth $transaction = array ('x_invoice_num' 'x_amount' 'x_card_num' 'x_exp_date' 'x_method' 'x_type'
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'99999', // Invoice number '45.99', // Amount '4007000000027', // Credit card no '1209', // Expiration date 'CC', // Payment method 'AUTH_ONLY'); // Transaction type
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$request->SetRequest($transaction); $auth_only_response = $request->GetResponse(); $_SESSION['auth_only_response'] = $auth_only_response; $auth_only_response = explode('|', $auth_only_response); // Read the transaction ID, which will be necessary for taking the payment $ref_trans_id = $auth_only_response[6]; // Capture $transaction = array ('x_ref_trans_id' => $ref_trans_id, // Transaction id 'x_method' => 'CC', // Payment method 'x_type' => 'PRIOR_AUTH_CAPTURE'); // Transaction type $request->SetRequest($transaction); $prior_auth_capture_response = $request->GetResponse();
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CHAPTER 15 CREDIT CARD TRANSACTIONS
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$_SESSION['prior_auth_capture_response'] = $prior_auth_capture_response; } else { switch ($_GET['step']) { case 1: print $_SESSION['auth_only_response']; break; case 2: print $_SESSION['prior_auth_capture_response']; break; } exit; } > <frameset cols="50%, 50%"> <frame src="test_authorize_net.php step=1"> <frame src="test_authorize_net.php step=2"> </frameset> 4. Load the test_authorize_net.php page in your favorite browser to see the results (see Figure 15-3).
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Figure 15-3. Authorize.net transaction results
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CHAPTER 15 CREDIT CARD TRANSACTIONS
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5. Go to Authorize.net, log in to Merchant Interface (https://test.authorize.net/), and you can see the transaction you just performed in the Unsettled Transactions section under the Search tab. This report is shown in Figure 15-4.
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Figure 15-4. Authorize.net Unsettled Transactions
How It Works: Authorize.net Transactions
The hard work is done by the AuthorizeNetRequest class, which has two important methods: SetRequest is used to set up transaction details, and GetResponse is used to send the request to, and retrieve the response from, Authorize.net. The following code snippet shows how they are used: // Auth $transaction = array ('x_invoice_num' 'x_amount' 'x_card_num' 'x_exp_date' 'x_method'
=> => => => =>
'99999', // Invoice number '45.99', // Amount '4007000000027', // Credit card number '1209', // Expiration date 'CC', // Payment method
CHAPTER 15 CREDIT CARD TRANSACTIONS
'x_type' $request->SetRequest($transaction); $response = $request->GetResponse();
=> 'AUTH_ONLY'); // Transaction type
Note The credit card data mentioned in this transaction is one of the magic card numbers provided by
Authorize.net for testing purposes. Review the AIM Implementation Guide for the complete list of such credit card numbers.
We send an array with transaction details as a parameter to SetRequest. SetRequest then joins this array with another array that contains the Authorize.net account details: public function SetRequest($request) { $this->_mRequest = ''; $request_init = array ('x_login' => AUTHORIZE_NET_LOGIN_ID, 'x_tran_key' => AUTHORIZE_NET_TRANSACTION_KEY, 'x_version' => '3.1', 'x_test_request' => AUTHORIZE_NET_TEST_REQUEST, 'x_delim_data' => 'TRUE', 'x_delim_char' => '|', 'x_relay_response' => 'FALSE'); $request = array_merge($request_init, $request); The array data is merged into a name-value string that can be sent to Authorize.net. The values are encoded for inclusion in the URL using the urlencode() function: foreach($request as $key => $value ) $this->_mRequest .= $key . '=' . urlencode($value) . '&'; } The GetResponse() method of AuthorizeNetRequest does the actual request, using the CURL library. // Send an HTTP POST request to Authorize.net using CURL public function GetResponse() { ... // Perform a CURL session $result = curl_exec($ch); // Close a CURL session curl_close ($ch); // Return the response
CHAPTER 15 CREDIT CARD TRANSACTIONS
return $result; } } > When executing the GetResponse() function to perform an AUTH_ONLY transaction, the response will contain a transaction ID. If the authorization is successful, we can then use this transaction ID to perform a PRIOR_AUTH_CAPTURE transaction, which effectively takes the money from the customer s account. As explained earlier, the response from Authorize.net comes in the form of a string that contains values delimited by a configurable character, which in our case is the pipe character (|). To read a particular value from the string, we transform the string into an array using the explode() PHP function (http://www.php.net/manual/ en/function.explode.php): $auth_only_response = $request->GetResponse(); $_SESSION['auth_only_response'] = $auth_only_response; $auth_only_response = explode('|', $auth_only_response); After this piece of code executes, $auth_only_response will contain an array whose elements are the values that were delimited by the pipe character in the original string. From this array, we re interested in the seventh element, which, according to the Authorize.net documentation, is the transaction ID. (Read the Gateway Response API details from http://www.authorize.net/support/AIM_guide.pdf for the complete details about the Authorize.net response.) // Read the transaction ID, which will be necessary for taking the payment $ref_trans_id = $auth_only_response[6];
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