<img src="https://chart.googleapis.com/chart?chs=300x300&cht=qr&chl=<?= get_permalink($id) ?>%2F&choe=UTF-8" title="<?= get_the_title($id) ?>" />
WordPress easy QR codes to pages using google API
<img src="https://chart.googleapis.com/chart?chs=300x300&cht=qr&chl=<?= get_permalink($id) ?>%2F&choe=UTF-8" title="<?= get_the_title($id) ?>" />