Can property managers pay themselves without HOA board approval?

The property management company is handling all payments for our Condominium association. We asked to have all our payments pre-approved by the board. They agreed but they pay their monthly management fees without approval from our bank account. Question: is it legal for the Property management company to pay their own bills without board approval? Their bills shows variable amounts based on services. They basically prepay their monthly fee by paying it on the 1st business day.