cf-domain-update

:global domain "home.example.com"
:global theinterface "internet-interface"
:global ipremote [:resolve $domain]
:global ipfresh [ /ip address get [/ip address find interface=$theinterface ] address ]
:if ([ :typeof $ipfresh ] != nil ) do={
   :for i from=( [:len $ipfresh] - 1) to=0 do={ 
      :if ( [:pick $ipfresh $i] = "/") do={ 
         :set ipfresh [:pick $ipfresh 0 $i];
      } 
   }
   :if ($ipremote != $ipfresh) do={
      :local cfmail "MY_CF@MAIL.COM"
      :local cfapikey "MY_CF_API_KEY"
      :local cfzoneid "MY_CF_ZONE_ID"
      :local cfdomainid "MY_CF_DOMAIN_ID"
      /tool fetch mode=https http-method=put \
      http-header-field="content-type:application/json,X-Auth-Email:$cfmail,X-Auth-Key:$cfapikey" \
      url="https://api.cloudflare.com/client/v4/zones/$cfzoneid/dns_records/$cfdomainid" \
      http-data="{\"type\":\"A\",\"name\":\"$domain\",\"content\":\"$ipfresh\",\"ttl\":1,\"proxied\":false}"
      :local ipremote $ipfresh
   }
}