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WHMCS

WHMCS is the complete all-in-one client management, billing & support solution for Web Hosts & Other Online Businesses. Packed with features but with a core focus on remaining easy to use and customize, WHMCS enables you to easily and effectively manage your business. It also automates many routine tasks including invoicing, order provisioning, suspensions, and more.
If you are using newest version of WHMCS, see the last step please.

Edit template

Find and open file /templates/orderforms/cart/complete.tpl

Locate right place for integration

Inside the file find this line: {if $ispaid}

Add integration code

Insert the following code just below that line:

Save file complete.tpl after you pasted integration code.
From now should be sale registered in PAP4 every time any order is payed.

NOTE

If you use cart order process, you have to edit /templates/orderforms/cart/complete.tpl
If you use boxes order process, you have to edit /templates/orderforms/boxes/complete.tpl
If you use default order process, you have to edit /templates/orderforms/default/complete.tpl
If you usesingle page order process, you have to edit /templates/orderforms/singlepage/complete.tpl

By default, the cart order process is used

If still nothing works

If still nothing works you have to use another type of integration:
Open in editor your WHMCS_install_directory/include/actionhooks.php
Find function actionhook_InvoicePaid and add this code into this function - after {

That is all, now it should work normally.

Multiple currencies

If you want to use multiple currencies, we have this code that should be inserted to actionhooks.php .... Thanks to Uwe from London.

//Get currency code is used in invoice
    $InvoiceID = $vars["InvoiceID"];
    $pap_query = mysql_query("SELECT tblcurrencies.code FROM tblinvoices
                 INNER JOIN tblclients ON (tblinvoices.userid = tblclients.id)
                 INNER JOIN tblcurrencies ON (tblclients.currency = tblcurrencies.id)
                 WHERE tblinvoices.id ='$InvoiceID'");
    $pap_query = mysql_fetch_array($pap_query);
    $ord_curr  = $pap_query['code'];

//use of customer field, here refererID as example
    //fieldid is an sequenze number of defined custom fields.
    $pap_query = mysql_query("SELECT tblcustomfieldsvalues.value FROM tblorders
                 INNER JOIN tblcustomfieldsvalues ON (tblorders.userid = tblcustomfieldsvalues.relid)
                 WHERE tblcustomfieldsvalues.fieldid = 2
                   AND tblinvoices.id ='$InvoiceID'");
    $pap_query = mysql_fetch_array($pap_query);
    $ord_affID = $pap_query['value'];

//Get OderNUmber, Invoice Amount and OrderID
    $InvoiceID = $vars["InvoiceID"];
    $pap_query = mysql_query("select amount from tblorders WHERE invoiceid='$InvoiceID'");
    $pap_query = mysql_fetch_array($pap_query);
    $ord_num     = $pap_query['ordernum'];
    $pap_saleamt = $pap_query['amount'];
    $orderid     = $pap_query['id'];
    $url = "http://www.yoursite.com/affiliate/scripts/sale.php?TotalCost=$pap_saleamt&OrderID=$orderid&ProductID=$ord_num&Currency=$ord_curr&AffiliateID=$ord_affID";

$ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 100);
    $result = curl_exec($ch);
    curl_close($ch);

For versions above 4

Please create new file in includes/hooks/ and name it somehow... Use this code for this file to integrate WHMCS:

WHMCS

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