Method to create Authorization Url for Apple Sign in Auhtorization for a user

AuthorizationUrl.java

import org.json.JSONObject;

/******
*To create authorization url for social sign in
this url will open authentication window for apple sign in
for a subdomain as state param
*****/
public String createAuthorizationUrl(String subDomain) {
        // I have added jsob objct for encodin state paramters like for getting the curent domain used as we have multiple subdomains, you can add your state parameters here
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("subDomain", subDomain);
        try {
            String url = "https://appleid.apple.com/auth/authorize?client_id=" + appleClientId + 
              "&redirect_uri=" + redirectUrl + 
              "&response_type=code%20id_token" +  // to request code and id token both
              "&scope=" + "name%20email" +  // scopes are name email
              "&response_mode=" + "form_post" +  // when we request id token only form_post will be available
              "&state=" + URLEncoder.encode(jsonObject.toString(), "UTF-8");
            return url;
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return "";
    }