generic bitpay usigned wrapper
    passing a payload will do a POST, otherwise a GET

def unsigned_request(self, path, payload=None):
    """
    generic bitpay usigned wrapper
    passing a payload will do a POST, otherwise a GET
    """
    headers = {"content-type": "application/json", "accept": "application/json", "X-accept-version": "2.0.0"}
    try:
      if payload:
        response = requests.post(self.uri + path, verify=self.verify, data=json.dumps(payload), headers=headers)
      else:
        response = requests.get(self.uri + path, verify=self.verify, headers=headers)
    except Exception as pro:
      raise BitPayConnectionError('Connection refused')
    return response