code: function getBroadcastReachEstimation (reach_estimation_id) {
    return new Promise (async (resolve, reject) => {
      if (!reach_estimation_id) {
        reject('Valid reach_estimation_id required');
        
      }
      let options = {
        'reach_estimation_id': reach_estimation_id
      };
      try {
        let response = await this.callBroadcastApi(options);
        resolve(response);
      } catch (e) {
        reject(e);
      }
    });
  }
docs: Get the current status of a broadcast reach estimation
  {@link #startbroadcastreachestimation|`startBroadcastReachEstimation`
  must be run first to get a `reach_estimation_id`.
  @param  {Integer}  reach_estimation_id   The reach estimation ID.
  @return {Promise<Object>}  The API Response
  @memberof  Client#
  @example
  Client.getBroadcastReachEstimation(9485676932424)
  .then(res => {
  console.log(res); // {"reach_estimation": "100", "id": "9485676932424"}
  });