code: public Payload setAccessTokenHash(String accessTokenHash) {
          this.accessTokenHash = accessTokenHash;
          this.put(PayloadConstants.AT_HASH, accessTokenHash);
          return this;
      }
docs: Sets the access token hash value or {@code null} for none.
  
  <p>
  Overriding is only supported for the purpose of calling the super implementation and changing
  the return type, but nothing else.
  </p>