code: public JWTPayload setIssuedAtTimeSeconds(Long issuedAtTimeSeconds) {
          this.issuedAtTimeSeconds = issuedAtTimeSeconds;
          this.put(PayloadConstants.ISSUED_AT_TIME_IN_SECS, issuedAtTimeSeconds);
          return this;
      }
docs: Sets the issued at claim that identifies the time (in seconds) at which the JWT was issued 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>