FairPay logs its activities in the fairpay directory, and each program has its its own log. The log format is event-style, one line per event of any program. All program events are grouped together, between a beginning and end-of-processing pair event lines.

The format of any given line is:

• The program name as listed in the filesystem
• The process ID in square brackets
• The full date and time followed by a colon
• The text for the event.

Logging has three states: on, off, or rolling. If you set logging to on, logging will be performed. If you set it to off, only transactions with fatal errors will be logged. If you set log_size to an integer, the log will roll off old entries when it reaches that number of lines. The log_size will default to unlimited by default.