lockbox
noun [ C ]
BANKING uk/ˈlɒkbɒks/ usa service provided by banks in which a company's customers send payments directly to a bank so that the money can be paid immediately into the company's bank account:
lockbox facility/service Checks are sent to a post office box in Pittsburgh, to be processed through the bank's lockbox facility.
a strong, locked container used for storing money and valuable possessions:
He has a lockbox at the back of the office where he stores cash and other valuables.