> ## Documentation Index
> Fetch the complete documentation index at: https://docs.superoffice.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom domains registration

> Sub-domains and custom domains registration form

export const SOForm = ({scriptUrl}) => {
  const scriptRef = useRef(null);
  useEffect(() => {
    const script = document.createElement('script');
    script.src = scriptUrl;
    script.async = true;
    if (scriptRef.current && !scriptRef.current.querySelector('script')) {
      scriptRef.current.appendChild(script);
    }
    return () => {
      if (scriptRef.current && scriptRef.current.contains(script)) {
        scriptRef.current.removeChild(script);
      }
    };
  }, [scriptUrl]);
  return <div ref={scriptRef} />;
};

Fill in the form to register sub-domains and additional domains for your IDP.

<SOForm scriptUrl="https://online2.superoffice.com/Cust1990/CS/scripts/customer.fcgi?action=form&id=F-CPikjXvi" />


## Related topics

- [Reasons to customize Mailgun](/en/online/mail-services/mailgun/reasons-to-customize.md)
- [Register identity provider (domain name)](/en/online/identity/superid/howto/register-idp.md)
- [Chatbot registration](/en/automation/chatbot/registration.md)
- [OAuth 2.0 with Microsoft 365](/en/online/mail-services/curl/oauth-microsoft365.md)
- [Email in Service and Marketing](/en/online/mail-services/curl/index.md)
- [Check Access Gateway Registration](/en/api/reference/restful/agent/user_agent/check-access-gateway-registration.md)