code: public void redeemRewards(int count, BranchReferralStateChangedListener callback) {
          redeemRewards(Defines.Jsonkey.DefaultBucket.getKey(), count, callback);
      }
docs: <p>Redeems the specified number of credits from the "default" bucket, if there are sufficient
  credits within it. If the number to redeem exceeds the number available in the bucket, all of
  the available credits will be redeemed instead.</p>
  
  @param count    A {@link Integer} specifying the number of credits to attempt to redeem from
  the bucket.
  @param callback A {@link BranchReferralStateChangedListener} callback instance that will
  trigger actions defined therein upon a executing redeem rewards.