Factura.md app is used for payers notification about the issued bills and their terms of payment.
Each payer (client of your organization) installs by himself factura.md app on his smartphone.
Notification is received on subscription basis. To add new subscription is enough just to specify the payers id and factura.md app will take care in order the payer will not miss the payment date.
Factura.md app doesnt operate with the personal data, which allows unique identification of the person, it operates only with subscription for the specified payer id.