old_contents: import warnings
  from typing import TYPE_CHECKING, List
  
  from django.conf import settings
  
  if TYPE_CHECKING:
      from ..interface import GatewayConfig
  
  
  def get_supported_currencies(config: "GatewayConfig", gateway_name: str) -> List[str]:
      supp_currencies = config.supported_currencies
      if not supp_currencies:
          currencies = [settings.DEFAULT_CURRENCY]
          warnings.warn(
              f"Default currency used for {gateway_name}. "
              "DEFAULT_CURRENCY setting is deprecated, "
              "please configure supported currencies for this gateway."
          )
      else:
          currencies = [c.strip() for c in supp_currencies.split(",")]
  
      return currencies
  
new_contents: import re
  import warnings
  from typing import TYPE_CHECKING, List
  
  from django.conf import settings
  
  if TYPE_CHECKING:
      from ..interface import GatewayConfig
  
  
  def get_supported_currencies(config: "GatewayConfig", gateway_name: str) -> List[str]:
      supp_currencies = config.supported_currencies
      if not supp_currencies:
          currencies = [settings.DEFAULT_CURRENCY]
          warnings.warn(
              f"Default currency used for {gateway_name}. "
              "DEFAULT_CURRENCY setting is deprecated, "
              "please configure supported currencies for this gateway."
          )
      else:
          currencies = [c.strip() for c in supp_currencies.split(",")]
  
      return currencies
  
subject: Update supported currencies in gateways, set default currency for dummy gateway