code: def upcoming_invoice(self, **kwargs):
  		
  		from .billing import Invoice
  
  		kwargs["customer"] = self
  		return Invoice.upcoming(**kwargs)
docs: Gets the upcoming preview invoice (singular) for this customer.
  
  		See `Invoice.upcoming() <#djstripe.Invoice.upcoming>`__.
  
  		The ``customer`` argument to the ``upcoming()`` call is automatically set by this method.