It would be easier to make payment, if UPI Qr code is generated by Zoho Books and shown in the invoice itself. This will promote digital payments and also makes it easier for customers to pay.
It would be even helpful, if QR code contains the invoice amount so that the field is autofilled while making payment in PhonePe, Google Pay etc.
I had tried to implement this in Invoice (Bank details section). However, in Invoice PDF if QR Code is shown, invoice logo would not be shown or if logo is shown QR code is not shown in PDF.