code: function () {
  
      const oThis = this;
  
      // validations
      if (!basicHelper.isAddressValid(oThis.simpleStakeContractAddress)) {
        let errObj = responseHelper.error({
          internal_error_identifier: 's_s_m_gsak_1',
          api_error_identifier: 'invalid_address',
          error_config: basicHelper.fetchErrorConfig()
        });
        return Promise.resolve(errObj);
      }
  
      const simpleStake = new SimpleStakeKlass({contractAddress: oThis.simpleStakeContractAddress})
  
      return simpleStake.getAlltimeStakedAmount();
  
    }
docs: Perform
  
  @return {promise<result>}