How to determine whether the VeriFactu or TicketBai systems are obligatory to be used for companies located in Spain?

As we have already stated, Spain will become fiscal next year. One part of the Spain-Basque region is already fiscal because the TicketBai obligation (specialized software for issuing receipts) has started there. For the rest of Spain (so-called Mainland territory) (excluding the Basque, Canary Islands, and islands towards Africa), the new system will be presented next year, and its name is VeriFactu (with special requirements for software for issuing receipts).