code: public void getCreditHistory(@NonNull final String bucket, BranchListResponseListener
              callback) {
          getCreditHistory(bucket, null, 100, CreditHistoryOrder.kMostRecentFirst, callback);
      }
docs: <p>Gets the credit history of the specified bucket and triggers a callback to handle the
  response.</p>
  
  @param bucket   A {@link String} value containing the name of the referral bucket that the
  code will belong to.
  @param callback A {@link BranchListResponseListener} callback instance that will trigger
  actions defined therein upon receipt of a response to a create link request.