request_uses_message

If true, the Message parameter to RequestSubscription is likely to be significant, and user interfaces SHOULD prompt the user for a message to send with the request; a message such as "I would like to add you to my contact list", translated into the local user's language, might make a suitable default.

For this property to be valid, you must first call prepare_async with the feature TP_CONNECTION_FEATURE_CONTACT_LIST_PROPERTIES or TP_CONNECTION_FEATURE_CONTACT_LIST .