The good thing is that almost everyone already has Bancomat Pay without realising it. You just have to activate it with the app.
Edit: they are saying in the press release that everyone is welcome on board and I suspect that Satispay is not too keen to join
Edit 2 (more context): Many stores accept Satispay, but Iโd doubt that there are many who know about Bancomat Pay. Iโve seen mainly in self checkouts at supermarkets. Also, Satispay has a developer website, but I havenโt been able to find one for Bancomat Pay