Android Question Information on issuing fiscal receipts in Germany

Hi everyone,
I am working on a software project and I need some practical information on how cash registers operate in Germany.


Specifically, I would like to understand:

• How fiscal receipts are issued in Germany.
• Any specific formats or standards (e.g., data that must be included on the receipt, digital signatures, transmission protocols, etc.).
• Whether it is possible to send receipts directly to the German tax authority.

I am already in contact with the company EFSTA, but I would like to know if anyone has more concrete and up-to-date experience and could provide precise information.
If someone is available for collaboration or a more in-depth exchange of information, I would be very interested.


Thanks in advance for any suggestions or useful references!

Raffaele Viglione