'Update the CredentialInstance
:param unicode friendly_name: The friendly_name
:param unicode certificate: The certificate
:param unicode private_key: The private_key
:param bool sandbox: The sandbox
:param unicode api_key: The api_key
:param unicode secret: The secret
:returns: Updated CredentialInstance
:rtype: twilio.rest.chat.v1.credential.CredentialInstance'

def update(self, friendly_name=values.unset, certificate=values.unset, private_key=values.unset, sandbox=values.unset, api_key=values.unset, secret=values.unset):

    return self._proxy.update(friendly_name=friendly_name, certificate=certificate, private_key=private_key, sandbox=sandbox, api_key=api_key, secret=secret)
