# phpman > man > Net::OpenID::Extension(3pm)

## NAME
    [Net::OpenID::Extension](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AOpenID%3A%3AExtension/markdown) - Base class for OpenID extensions

## VERSION
    version 1.20

## METHODS
  CLASS->namespace_uris
    Return a hashref mapping namespace URIs to the aliases you will use to refer to them in the
    other methods. For example:

        return {
            '<http://example.com/some-extension>' => 'someext',
        };

  CLASS->new_request(@parameters)
    When your extension is added to the [Net::OpenID::ClaimedIdentity](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AOpenID%3A%3AClaimedIdentity/markdown) object in consumer-land, this
    method will be called to create a request object. Any additional arguments passed when adding
    the extension will be passed through verbatim in @parameters.

    The object you return here should at minimum provide the interface defined in
    [Net::OpenID::ExtensionMessage](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AOpenID%3A%3AExtensionMessage/markdown).

    You can return "undef" here if you have nothing useful to return.

  CLASS->received_request(\%args)
    In server-land, when a caller asks for the request object for your extension this method will be
    called to create a request object. %args maps the aliases you returned from the "namespace_uris"
    method to a hashref of the key-value pairs provided in that namespace.

    The object you return here should at minimum provide the interface defined in
    [Net::OpenID::ExtensionMessage](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AOpenID%3A%3AExtensionMessage/markdown), and should behave identically to the corresponding object
    returned from "new_request".

    You can return "undef" here if you have nothing useful to return.

  CLASS->new_response(@parameters)
    When your extension is added to the response in server-land, this method will be called to
    create a response object. Any additional arguments passed when adding the extension will be
    passed through verbatim in @parameters.

    You can return "undef" here if you have nothing useful to return.

  CLASS->received_response(\%args)
    In consumer-land, when a caller asks for the request object for your extension in
    [Net::OpenID::VerifiedIdentity](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AOpenID%3A%3AVerifiedIdentity/markdown) this method will be called to create a response object. %args maps
    the aliases you returned from the "namespace_uris" method to a hashref of the key-value pairs
    provided in that namespace.

    You can return "undef" here if you have nothing useful to return.