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Need sample code on how to use displayPDFInvoice hook


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I'm writing a payment module for the company I work at and need to add additional information in the invoice. I'm pretty sure I need the displayPDFInvoice hook, but I can't find any information about this. Does anyone have a sample how to use it? 




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Here is a sample from one of my modules.  This code supports PS v1.4, v1.5 and v1.6.  If you only need to support PS v1.5+ then remove the v1.4 code and make life easier

public function hookPDFInvoice($params)
    //this code obtains the id_order from the function parameter.  The way to do this is different for PS v1.4 and v1.5+
    $id_order = (int)$params['id_order'];    //ps1.4
    if (version_compare(_PS_VERSION_, '1.5', '>='))
        $order_invoice = $params['object'];
        if (!($order_invoice instanceof OrderInvoice))
        $id_order = (int)$order_invoice->id_order;

        //use this for PS v1.5+ 
        if (version_compare(_PS_VERSION_, '1.5', '>='))
            return 'your content goes here.  You can also choose to use smarty and templates if it is complex';
        //use something like this for PS v1.4
        $params['pdf']->SetFont(PDF::fontname(), '', 9);
        $params['pdf']->Cell(150, 6, Tools::iconv('utf-8', PDF::encoding(), 'some content here'), 1, 0, 'R', 1);
        $params['pdf']->Cell(0, 6, 'some other content here', 1, 2, 'L', 1);
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