Oregon Revised Statutes Revenue and Taxation § 323.175

A licensed distributor may apply to the Department of Revenue to fix the maximum amount of deferred-payment purchases of stamps that the distributor may make in any calendar month. Upon receipt of the application and the security deposit required pursuant to ORS 323.110, the department shall fix the maximum amount. The department at any time may designate the sales locations where the distributor may make deferred-payment purchases of stamps and fix the amount of deferred-payment purchases that the distributor may make within each monthly period at the designated sales location.