However, the good thing about this site is that there is no KYC but the drawback to using it is that they will charge a 1% fee.
Does anyone know a site where they don't charge any fee
I see no point at all using invoices in crypto.
All blockchain transactions are open and you can see all of them for free. Why would you pay 1% to see the transaction in the blockchain?
Some block explorers like blockchair even have a buttom called invoice which is basically the pdf version of the transaction
Something like this
https://blockchair.com/bitcoin/transaction/c2b5eea3e485a284ed9c7fad814e69fa6f23aff26ac0176c6262a80e3ca04691.pdf