Not acceptable!!!!!!!!!!!

[Rahat_Arif]

/*
 * QR Encoding Functions
 */

/*
 * QR Code
 */
$dataToEncode = [
    [1, $companyname],
    [2, $taxCode],
    [3, $datecreated],
    [4, $totalPay],
    [5, $totalTax]
];

$__TLV = __getTLV($dataToEncode);
$__QR = base64_encode($__TLV);

$style = array(
    'border' => 0,
    'vpadding' => 'auto',
    'hpadding' => 'auto',
    'fgcolor' => array(0, 0, 0),
    'bgcolor' => false, //array(255,255,255)
    'module_width' => 1, // width of a single module in points
    'module_height' => 1 // height of a single module in points
 );

$pdf->write2DBarcode($__QR, 'QRCODE,L', 155, $pdf->getY(), 30, 30, $style);

/*
 * QR Code Function ends
 */

I was changes in invoicepdf.tpl file to generate qr in invoice  pdf ...but client not accept this...he wants to use addons to call from outside this code and then generate qr both invoice pdf before download and after download invoice ..I am new in whmcs !! Please help me ....