1) Delivery Note should have customer name, date and signature
2) An option to refer to Customer Sales Order
3) Once the delivery us made and customer signs for item electronically then delivery person can just print a copy using a mobile printer such as Zebra etc.
4) The signature will be placed on Zoho Books/ Inventory as delivery with signature

5) If this is a cash transaction or even credit card payment option for a receipt and also be made and printed

This is for option is for Zoho Books/Invoice/Inventory