diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
index 52b2a717d2..d0f8da7516 100644
--- a/synapse/federation/transport/client.py
+++ b/synapse/federation/transport/client.py
@@ -471,3 +471,49 @@ class TransportLayerClient(object):
)
defer.returnValue(content)
+
+ @log_function
+ def invite_to_group_notification(self, destination, group_id, user_id, content):
+ """Sent by group server to inform a user's server that they have been
+ invited.
+ """
+
+ path = PREFIX + "/groups/local/%s/users/%s/invite" % (group_id, user_id)
+
+ return self.client.post_json(
+ destination=destination,
+ path=path,
+ data=content,
+ ignore_backoff=True,
+ )
+
+ @log_function
+ def remove_user_from_group_notification(self, destination, group_id, user_id,
+ content):
+ """Sent by group server to inform a user's server that they have been
+ kicked from the group.
+ """
+
+ path = PREFIX + "/groups/local/%s/users/%s/remove" % (group_id, user_id)
+
+ return self.client.post_json(
+ destination=destination,
+ path=path,
+ data=content,
+ ignore_backoff=True,
+ )
+
+ @log_function
+ def renew_group_attestation(self, destination, group_id, user_id, content):
+ """Sent by either a group server or a user's server to periodically update
+ the attestations
+ """
+
+ path = PREFIX + "/groups/%s/renew_attestation/%s" % (group_id, user_id)
+
+ return self.client.post_json(
+ destination=destination,
+ path=path,
+ data=content,
+ ignore_backoff=True,
+ )
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