def iq_set_stanza_handler(payload_class, payload_key = None,<EOL>usage_restriction = "<STR_LIT>"):
return _iq_handler("<STR_LIT>", payload_class, payload_key, usage_restriction)<EOL>
Method decorator generator for decorating <iq type='set'/> stanza
    handler methods in `XMPPFeatureHandler` subclasses.

    :Parameters:
        - `payload_class`: payload class expected
        - `payload_key`: payload class specific filtering key
        - `usage_restriction`: optional usage restriction: "pre-auth" or
          "post-auth"
    :Types:
        - `payload_class`: subclass of `StanzaPayload`
        - `usage_restriction`: `unicode`