We never said we've developed it. You can check the project's text files and post page for the credits. Its everywhere! These youtube videos are only for sharing demo, so we didn't mentioned anything.
Please, the electronic invoice program is identical to the electronic invoice in Saudi Arabia, and the user can send the invoice to the email as well as read it in the VAT program. The invoice contains a qrcode and the invoice can be printed in several sizes. Please, I want this system. Help me