code: void setInstallOrOpenCallback(Branch.BranchReferralInitListener callback) {
          synchronized (reqQueueLockObject) {
              for (ServerRequest req : queue) {
                  if (req != null) {
                      if (req instanceof ServerRequestRegisterInstall) {
                          ((ServerRequestRegisterInstall) req).setInitFinishedCallback(callback);
                      } else if (req instanceof ServerRequestRegisterOpen) {
                          ((ServerRequestRegisterOpen) req).setInitFinishedCallback(callback);
                      }
                  }
              }
          }
      }
docs: Sets the given callback to the existing open or install request in the queue
  
  @param callback A{@link Branch.BranchReferralInitListener} callback instance.