old_contents: # -*- coding: utf-8 -*-
  import environ
  env = environ.Env()
  HOLVI_CNC = False
  
  def get_holvi_singleton():
      global HOLVI_CNC
      if HOLVI_CNC:
          return HOLVI_CNC
      holvi_pool = env('HOLVI_POOL', default=None)
      holvi_key = env('HOLVI_APIKEY', default=None)
      if not holvi_pool or not holvi_key:
          return False
      import holviapi
      HOLVI_CNC = holviapi.Connection(holvi_pool, holvi_key)
      return HOLVI_CNC
  
new_contents: # -*- coding: utf-8 -*-
  import holviapi.utils
  
  def get_nordea_payment_reference(member_id, number):
      base = member_id + 1000
      return holviapi.utils.int2fin_reference(int("%s%s" % (base, number)))
  
subject: Remove copy-pasted code, add helper for making legacy reference number for payments