Please add a payment link to the "Print Bill" (just below the QR code) receipt that can be sent via text or email to the client, so upon receiving a copy of their bill, they can direct their device (without scanning) to the payment screen (as if they have scanned a QR code).

A QR code works only when the actual printer bill (paper) is delivered to the client. What happens when the printed bill is sent via email or text ?? the client will either need to print the receipt, so he can scan it, or use to devices (one to display the QR code and another to scan it)
But, if a Hyperlink is added below the QR code, they can just follow it.
Much simpler and does not require the client to touch anything other that their phone or computer (this will also ve very helpful for retail merchants. -- Please URGENT