def create(self, available_add_on_sid, accept_terms_of_service,<EOL>configuration=values.unset, unique_name=values.unset):
data = values.of({<EOL>'<STR_LIT>': available_add_on_sid,<EOL>'<STR_LIT>': accept_terms_of_service,<EOL>'<STR_LIT>': serialize.object(configuration),<EOL>'<STR_LIT>': unique_name,<EOL>})<EOL>payload = self._version.create(<EOL>'<STR_LIT:POST>',<EOL>self._uri,<EOL>data=data,<EOL>)<EOL>return InstalledAddOnInstance(self._version, payload, )<EOL>
Create a new InstalledAddOnInstance

:param unicode available_add_on_sid: A string that uniquely identifies the Add-on to install
:param bool accept_terms_of_service: A boolean reflecting your acceptance of the Terms of Service
:param dict configuration: The JSON object representing the configuration
:param unicode unique_name: The string that uniquely identifies this Add-on installation

:returns: Newly created InstalledAddOnInstance
:rtype: twilio.rest.preview.marketplace.installed_add_on.InstalledAddOnInstance