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+# Registering an Application Service
+
+The registration of new application services depends on the homeserver used. 
+In synapse, you need to create a new configuration file for your AS and add it
+to the list specified under the `app_service_config_files` config
+option in your synapse config.
+
+For example:
+
+```yaml
+app_service_config_files:
+- /home/matrix/.synapse/<your-AS>.yaml
+```
+
+The format of the AS configuration file is as follows:
+
+```yaml
+url: <base url of AS>
+as_token: <token AS will add to requests to HS>
+hs_token: <token HS will add to requests to AS>
+sender_localpart: <localpart of AS user>
+namespaces:
+  users:  # List of users we're interested in
+    - exclusive: <bool>
+      regex: <regex>
+    - ...
+  aliases: []  # List of aliases we're interested in
+  rooms: [] # List of room ids we're interested in
+```
+
+See the [spec](https://matrix.org/docs/spec/application_service/unstable.html) for further details on how application services work.