Add QR code to PDF template invoicepdf.tpl

[Evgeny]

Hi,

I have module bankinvoice and it generate qr code for banks. I want to add QR code picture to PDF template in file invoicepdf.tpl

I add all php code at the begin of file invoicepdf.tpl

... code .. code... 

$qrcode = base64_encode($contents);

in callback php file i use this string to show it

<img style="width: 35mm; height: 35mm;" src="data:image/png;base64, <? echo $qrcode; ?>" />

and it show qr code.

Return to file invoicepdf.tpl

I try this 

$pdf->writeHTML($qrcode, true, false, false, false, '');

and it show content in base64 result: BxCry.. ...sria7=

It's tell me that inserted code work good and i try to show it as image

$paymethhtml = '
<img style="width: 35mm; height: 35mm;" src="data:image/png;base64,
'.$qrcode.' />';

$pdf->writeHTML($paymethhtml, true, false, false, false, '');

but it not add QR (PDF generated as base, i think that i make something wrong. Please help to execute this string: 

<img style="width: 35mm; height: 35mm;" src="data:image/png;base64, <? echo $qrcode; ?>" />

in file invoicepdf.tpl correctly to show QR in PDF.