You received an invitation to a bridal shower asking for money to pay for the wedding because the bride and groom already have everything for their home Is this correct to ask for money?

yes! it is common for wedding couples to ask instead of gifts. In this day and age there are 1. many people who are living together already and have everything they need. 2. people are getting married later in life . 3. some it is their second wedding. so gifts are not needed and money is better.