RouterOS raise HTTP event when dynamic IP address changes

reportDynamicIPChanged.txt

:global previousIP 1.2.3.4
:global ipAddressCheckURL "http://ifconfig.me/ip"
# or... :global ipAddressCheckURL "http://icanhazip.com"
:global ipChangedEventURL "https://webhook.site/12345678-9610-4f57-9bfe-a3c5e2551d26"
/system/script/add name=reportDynamicIPChanged source={
  :global ipAddressCheckURL
  :global ipChangedEventURL
  :local result [/tool fetch url=$ipAddressCheckURL mode=http as-value output=user];
  :if ($result->"status" = "finished") do={
    :local currentIP ($result->"data");
    :local previousIP [/system script environment get [find name="previousIP"] value];
    :local systemID [/system identity get name];
    :local eventID [/rndstr length=32];
    :local eventTime [/system clock get time as-string];
    :local formattedTime ([/system clock get date as-string] . "T" . $eventTime . "Z");
    :if ($currentIP != $previousIP) do={
        /system script environment set [find name="previousIP"] value=$currentIP;
        :local jsonPayload ("{\"specversion\": \"1.0\", \"type\": \"tech.golder.infra.ipaddressupdates\", \"source\": \"/" . $systemID . "/script/reportDynamicIPChanged\", \"id\": \"" . $eventID . "\", \"time\": \"" . $formattedTime . "\", \"subject\": \"IP Address Update\", \"datacontenttype\": \"application/json\", \"data\": {\"name\": \"" . $systemID . "\", \"ipv4\": \"" . $currentIP . "\", \"ipv6\": \"\"}, \"dataschema\": \"https://golder.tech/schemas/ipaddressupdates\"}");
        /tool fetch url=$ipChangedEventURL http-method=post http-header-field="Content-Type: application/json" http-data=($jsonPayload);
    }
  }
}