old_contents: import stripe
  
  from . import charges
  from .. import utils
  
  
  def create(charge, amount=None):
      if amount is None:
          stripe.Refund.create(charge=charge.stripe_id)
      else:
          stripe.Refund.create(
              charge=charge.stripe_id,
              amount=utils.convert_amount_for_api(charge.calculate_refund_amount(amount=amount), charge.currency)
          )
      charges.sync_charge_from_stripe_data(charge.stripe_charge)
  
new_contents: import stripe
  
  from . import charges
  from .. import utils
  
  
  def create(charge, amount=None):
      """
      Creates a refund for a particular charge
  
      Args:
          charge: the charge against which to create the refund
          amount: how much should the refund be, defaults to None, in which case
                  the full amount of the charge will be refunded
      """
      if amount is None:
          stripe.Refund.create(charge=charge.stripe_id)
      else:
          stripe.Refund.create(
              charge=charge.stripe_id,
              amount=utils.convert_amount_for_api(charge.calculate_refund_amount(amount=amount), charge.currency)
          )
      charges.sync_charge_from_stripe_data(charge.stripe_charge)
  
subject: Add docstrings for refunds actions