Add a Data Limit To Trial Hotspot Users - MikroTik Script RouterOS

The following script allows you to assign a data limit to trial hotspot users and

a) have them kicked offline upon reaching this limit
b) create a temporary local user to stop them from logging back in again
This is a feature which is not available via the current hotspot settings, so I decided to script it into existence. Enjoy!

Script to check users for those over the limit:
Make a scheduler entry to run this every X minutes, I'd recommend every 5-10 minutes.

#Download limit in MB
:local downquotamb "50"
# Do not modify anything below this line #
:local downquota [$downquotamb * 1000]
:local counter
:local datadown
:local username
:local macaddress
:foreach counter in=[/ip hotspot active find ] do={
:set datadown [/ip hotspot active get $counter bytes-out]
:if ($datadown>$downquota) do={
:set username [/ip hotspot active get $counter user]
:set macaddress [/ip hotspot active get $counter mac-address]
/ip hotspot user remove [/ip hotspot user find where name=$username]
/ip hotspot user add name=$username limit-bytes-out=$downquota mac-address=$macaddress
/ip hotspot active remove $counter
:log info "Logged out $username - Reached download quota"
}}
Script to clear all manually created user accounts; this can be done hourly, daily or weekly depending on your requirements.

:foreach counter in=[/ip hotspot user find ] do={/ip hotspot user remove \$counter}
Notes: 
You can modify how often you want each of the script

Credit: https://wiki.mikrotik.com/wiki/Add_a_data_limit_to_trial_hotspot_users