This plugin provides shortcodes for generating Paynow QR code.
[paynow_img][paynow_qrcode uen='my_uen' amount=100 ref='MyReference' ][/paynow_img]
The Javascript QR code are taken from https://gist.github.com/chengkiang/7e1c4899768245570cc49c7d23bc394c.
The Javasript QR code are taken from https://github.com/davidshimjs/qrcodejs.
The PHP paynow QR code generated are adapted from PaynowQR.
The CRC script is taken from https://beccati.com/crc16.php.
This plugin also uses php-qrcode to generate the QR code image.