(1) For billing, facilities must submit a vendor invoice to the department monthly. The invoice must contain the following data for the preceding month:

(a) for each inmate incarcerated in the facility:

(i) the name and adult offender number of each inmate that was incarcerated in the facility the preceding month;

(ii) the date each inmate's incarceration began and if applicable, the date it ended; and

(iii) based on the dates of incarceration including the first day, but not the last, the total number of days each inmate spent incarcerated in the facility; and

(b) the amount due the facility based on the number of inmate days times the fixed rate per inmate per day.

(2) The department shall pay each correctly submitted invoice within 30 days of receipt. The department will make reasonable efforts to pay the governing body by wire transfer in accordance with the governing body's written instructions.