Pope Francis has brought in new regulations for the Vatican's process of making saints after allegations of abuses in the system.
Two recent books claimed officials get huge payments for investigating candidates for sainthood, with little control over how they spend the money.
The new rules mean external oversight of the bank accounts concerned.
Pope Francis has made reform of the Vatican a priority of his papacy, including perceived corruption.
The new rules set out the mechanism by which donors supporting a candidate for sainthood pay for the services of the Congregation for the Causes of Saints, the Vatican office responsible for reviewing candidates for sainthood.