'Hi....Can someone help me with getting TWITTER_OAUTH2_REFRESH_TOKEN from twitter developer portal

I am trying to create a tweet and follow a twitter account from springboot application.I am using twitter-api-java-sdk.

TwitterApi apiInstance = new TwitterApi();
TwitterCredentialsOAuth2 credentials = new 
TwitterCredentialsOAuth2(System.getenv("TWITTER_OAUTH2_CLIENT_ID"),
      System.getenv("TWITTER_OAUTH2_CLIENT_SECRET"),
      System.getenv("TWITTER_OAUTH2_ACCESS_TOKEN"),
      System.getenv("TWITTER_OAUTH2_REFRESH_TOKEN"));
apiInstance.setTwitterCredentials(credentials);

from where will I get TWITTER_OAUTH2_REFRESH_TOKEN?



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