Let's do one test at a time, for now can you test the plugin with this configuration for the shop command?
With this configuration you can use the shop command 1 time per minute, let me know if this configuration works, so I can exclude a possible problem with the hooks
{
"Enabled": true,
"Command": "shop",
"BlockCommand (If set to TRUE players will no longer be able to use this command. Default FALSE)": false,
"SafeZone. Value [AllowOnly | Allow | Block] (Default Allow)": "Allow",
"BuildingBlocked. Value [AllowOnly | Allow | Block] (Default Allow)": "Allow",
"CanBeBypassed (If set to TRUE the command block can be bypassed. It depends on the user permissions)": false,
"CooldownSeconds (-1 infinite)": 50,
"MaxUsagePerMinute (-1 infinite)": -1,
"MaxUsagePerHour (-1 infinite)": -1,
"MaxUsagePerDay (-1 infinite)": 100,
"MaxUsagePerWipe (-1 infinite)": 100
},