Who said anything about screenshots?

I meant something like the receipts localbitcoins issues. Or whatever message "pay this amount, to this address, for this product", signed with a private key - that's all you need for a digital receipt, mr big smartass but small imagination.

And BTW, good luck taking your payment protocol receipt to court when the merchant claims you didn't pay.
You are obviously living in a dream world. Though most Americans do, so you are just following the pattern.