This simple scripts are designed to implement DDNS feature using the service Cloudflare.
Scripts work only on RouterOS version 6.44 and above.
Depends on Mikrotik JSON Parser project installed as system script with name JParseFunctions.
Each script (IPv4 and IPv6) has a configuration area. Just insert your values.
First of all you need your Cloudflare API key. Just go to the Cloudflare site My Profile -> API Keys section -> Global API Key -> View. Follow the instructions. Now you have your API key. Keep it safe.
The service does not allow easy retrieval of required Zone and DNS record identifiers. This is only possible through a REST API methods List Zones and List DNS Records. Using any REST client (I use Advanced REST client for Chrome Browser), sending a request, you will receive the JSON answer with necessary Zone and DNS Record IDs.
Insert all variables in scripts and install in your Mikrotik device.
You may add this script to system scheduler as periodically task.