@property<EOL><INDENT>def grant_type(self):<DEDENT>
return self._grant_type<EOL>
Gets the grant_type of this ObtainTokenRequest.
Specifies the method to request an OAuth access token. Valid values are: `authorization_code`, `refresh_token`, and `migration_token`

:return: The grant_type of this ObtainTokenRequest.
:rtype: str