Yes, StayPlus will issue a regular invoice for the purchased services. The invoice will show VAT (+ VAT) and is fully deductible. The amount corresponding to StayPlus credits is fully deductible for IRES/IRPEF and IRAP purposes as a promotional expense.
Furthermore, as this is a service provided by StayPlus (through ShoppingPlus), it is invoiced with standard VAT at 22%, which is fully deductible for the facility.