The disclosure provides a method for passing a parameter between processors. For certain example embodiments, at least one device, such as a mobile device of a user or customer: may obtain one or more transaction characteristics of at least one product transaction that relates to at least one customer; or may communicate one or more messages to support a provisioning of at least one guaranty corresponding to at least one product transaction. The pilot operated spool valve includes a spool having a surface in fluid communication with the passageway; a spool input port; and a spool output port, at least one of the spool input port and the spool output port having a cross-section flow area that changes as the spool is actuated.