Bukkit

v1.42 for MC 1.6.2, 1.7.x, 1.8.x

• Added: each shopkeeper now additionally stores an unique id which shouldn't change over the shopkeepers lifetime.
• Attempt to fix potential issue with protection plugins, which cancle the PlayerInteractEvent because they want to deny usage of the shop creation item, not because denying access to the clicked chest: We now call another PlayerInteractEvent with the player not holding any items in hand, if that events gets cancelled as well we can be sure that the player has no access to the clicked chest.
  

Also please take a look at the changelogs of the versions since v1.20 for all not yet fully documented changes!

• If the trade for a written book fails players can sometimes still open and read the book if they close the shop and click the temporary fake book in their inventory fast enough. There is not much I can do about this..
• Server crashes and improper shutdowns might cause living non-citizens shopkeeper entities to duplicate sometimes.
• The 'always-show-nameplates' setting is no longer working on MC 1.8.
• Compatibility with older bukkit versions is untested. If you encounter any problems let me know and I will look into it.
• When switching from a bukkit version which support mojang uuids to a bukkit version which does not support mojang uuids yet all stored owner uuids of player shops are lost.

Also please take a look at the changelogs of the versions since v1.20 for all not yet fully documented changes!