code: protected File gettmpStore(String nic) {
  		if (consumer_key_storage == null || !consumer_key_storage.isDirectory()) {
  			if (e1 == 0) {
  				e1++;
  				log.error(
  						"No cert directory, can not save consumer_key! please set `consumer_key_storage` variable to a valid directory in your {}, or in your environ variale OVH_CONSUMER_KEY_STORAGE",
  						configFiles);
  			}
  			return null;
  		}
  		return new File(consumer_key_storage, nic + ".ck.txt");
  
  	}
docs: storage for previous CK
  
  @return File used to store consumer key