def verify_invoice_params(self, price, currency):
    """
    Deprecated, will be made private in 2.4
    """
    if re.match("^[A-Z]{3,3}$", currency) is None:
      raise BitPayArgumentError("Currency is invalid.")
    try: 
      float(price)
    except:
      raise BitPayArgumentError("Price must be formatted as a float")
Deprecated, will be made private in 2.4