Players who are buying many items from one shop causes the plugin to spam out the shop owner with each transaction. Perhaps this could instead go into a queue, and a summary of the transactions made in every interval (maybe every 15 seconds, or every minute?) can be sent to the shop owner.

May also want to consider offline storage (print shop transaction summary after a while when player joins), but if #6 is implemented then this really isn't all that necessary.

👍 I really like the idea of getting Messages when joining the server