diff --git a/src/main/java/io/kamax/mxisd/as/AppSvcManager.java b/src/main/java/io/kamax/mxisd/as/AppSvcManager.java
index 403beef..79c7a01 100644
--- a/src/main/java/io/kamax/mxisd/as/AppSvcManager.java
+++ b/src/main/java/io/kamax/mxisd/as/AppSvcManager.java
@@ -35,11 +35,18 @@ import io.kamax.mxisd.profile.ProfileManager;
 import io.kamax.mxisd.storage.IStorage;
 import io.kamax.mxisd.storage.ormlite.dao.ASTransactionDao;
 import io.kamax.mxisd.util.GsonParser;
+import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.introspector.BeanAccess;
+import org.yaml.snakeyaml.representer.Representer;
 
+import java.io.FileOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 import java.time.Instant;
 import java.util.*;
 import java.util.concurrent.CompletableFuture;
@@ -65,6 +72,26 @@ public class AppSvcManager {
         transactionsInProgress = new ConcurrentHashMap<>();
 
         processors.put("m.room.member", new MembershipProcessor(cfg.getMatrix(), profiler, notif, synapse));
+
+        processConfig();
+    }
+
+    private void processConfig() {
+        String synapseRegFile = cfg.getListener().getSynapse().getRegistrationFile();
+        if (StringUtils.isNotBlank(synapseRegFile)) {
+            SynapseRegistrationYaml syncCfg = SynapseRegistrationYaml.parse(cfg.getListener());
+
+            Representer rep = new Representer();
+            rep.getPropertyUtils().setBeanAccess(BeanAccess.FIELD);
+            Yaml yaml = new Yaml(rep);
+            String synCfgRaw = yaml.dump(syncCfg);
+
+            try {
+                IOUtils.write(synCfgRaw, new FileOutputStream(synapseRegFile), StandardCharsets.UTF_8);
+            } catch (IOException e) {
+                throw new RuntimeException("Unable to write synapse appservice registration file", e);
+            }
+        }
     }
 
     public AppSvcManager withToken(String token) {
diff --git a/src/main/java/io/kamax/mxisd/as/MembershipProcessor.java b/src/main/java/io/kamax/mxisd/as/MembershipProcessor.java
index c0d8643..2e9b3cf 100644
--- a/src/main/java/io/kamax/mxisd/as/MembershipProcessor.java
+++ b/src/main/java/io/kamax/mxisd/as/MembershipProcessor.java
@@ -26,7 +26,6 @@ import io.kamax.matrix.ThreePidMedium;
 import io.kamax.matrix._MatrixID;
 import io.kamax.matrix._ThreePid;
 import io.kamax.matrix.event.EventKey;
-import io.kamax.matrix.json.GsonUtil;
 import io.kamax.mxisd.backend.sql.synapse.Synapse;
 import io.kamax.mxisd.config.MatrixConfig;
 import io.kamax.mxisd.notification.NotificationManager;
@@ -63,7 +62,7 @@ public class MembershipProcessor implements EventTypeProcessor {
             return ev;
         });
 
-        if (!StringUtils.equals("invite", GsonUtil.getStringOrNull(content, "membership"))) {
+        if (!StringUtils.equals("invite", EventKey.Membership.getStringOrNull(content))) {
             log.debug("This is not an invite event, skipping");
             return;
         }
diff --git a/src/main/java/io/kamax/mxisd/as/SynapseRegistrationYaml.java b/src/main/java/io/kamax/mxisd/as/SynapseRegistrationYaml.java
new file mode 100644
index 0000000..370fedb
--- /dev/null
+++ b/src/main/java/io/kamax/mxisd/as/SynapseRegistrationYaml.java
@@ -0,0 +1,168 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2019 Kamax Sarl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.as;
+
+import io.kamax.mxisd.config.ListenerConfig;
+
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class SynapseRegistrationYaml {
+
+    public static SynapseRegistrationYaml parse(ListenerConfig cfg) {
+        SynapseRegistrationYaml yaml = new SynapseRegistrationYaml();
+
+        yaml.setId("appservice-mxisd");
+        yaml.setUrl(cfg.getUrl());
+        yaml.setAsToken(cfg.getToken().getAs());
+        yaml.setHsToken(cfg.getToken().getHs());
+        yaml.setSenderLocalpart(cfg.getLocalpart());
+        cfg.getUsers().forEach(template -> {
+            Namespace ns = new Namespace();
+            ns.setRegex(template.getTemplate());
+            ns.setExclusive(true);
+            yaml.getNamespaces().getUsers().add(ns);
+        });
+
+        return yaml;
+    }
+
+    public static class Namespace {
+
+        private String regex;
+        private boolean exclusive;
+
+        public String getRegex() {
+            return regex;
+        }
+
+        public void setRegex(String regex) {
+            this.regex = regex;
+        }
+
+        public boolean isExclusive() {
+            return exclusive;
+        }
+
+        public void setExclusive(boolean exclusive) {
+            this.exclusive = exclusive;
+        }
+
+    }
+
+    public static class Namespaces {
+
+        private List<Namespace> users = new ArrayList<>();
+        private List<Namespace> aliases = new ArrayList<>();
+        private List<Namespace> rooms = new ArrayList<>();
+
+        public List<Namespace> getUsers() {
+            return users;
+        }
+
+        public void setUsers(List<Namespace> users) {
+            this.users = users;
+        }
+
+        public List<Namespace> getAliases() {
+            return aliases;
+        }
+
+        public void setAliases(List<Namespace> aliases) {
+            this.aliases = aliases;
+        }
+
+        public List<Namespace> getRooms() {
+            return rooms;
+        }
+
+        public void setRooms(List<Namespace> rooms) {
+            this.rooms = rooms;
+        }
+
+    }
+
+    private String id;
+    private String url;
+    private String as_token;
+    private String hs_token;
+    private String sender_localpart;
+    private Namespaces namespaces = new Namespaces();
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public void setUrl(URL url) {
+        if (Objects.isNull(url)) {
+            this.url = null;
+        } else {
+            this.url = url.toString();
+        }
+    }
+
+    public String getAsToken() {
+        return as_token;
+    }
+
+    public void setAsToken(String as_token) {
+        this.as_token = as_token;
+    }
+
+    public String getHsToken() {
+        return hs_token;
+    }
+
+    public void setHsToken(String hs_token) {
+        this.hs_token = hs_token;
+    }
+
+    public String getSenderLocalpart() {
+        return sender_localpart;
+    }
+
+    public void setSenderLocalpart(String sender_localpart) {
+        this.sender_localpart = sender_localpart;
+    }
+
+    public Namespaces getNamespaces() {
+        return namespaces;
+    }
+
+    public void setNamespaces(Namespaces namespaces) {
+        this.namespaces = namespaces;
+    }
+
+}
diff --git a/src/main/java/io/kamax/mxisd/config/ListenerConfig.java b/src/main/java/io/kamax/mxisd/config/ListenerConfig.java
index 9a468b2..14d9937 100644
--- a/src/main/java/io/kamax/mxisd/config/ListenerConfig.java
+++ b/src/main/java/io/kamax/mxisd/config/ListenerConfig.java
@@ -25,9 +25,48 @@ import org.apache.commons.lang.StringUtils;
 
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
 
 public class ListenerConfig {
 
+    public static class Synpase {
+
+        private String registrationFile;
+
+        public String getRegistrationFile() {
+            return registrationFile;
+        }
+
+        public void setRegistrationFile(String registrationFile) {
+            this.registrationFile = registrationFile;
+        }
+
+    }
+
+    public static class UserTemplate {
+
+        private String type = "regex";
+        private String template;
+
+        public String getType() {
+            return type;
+        }
+
+        public void setType(String type) {
+            this.type = type;
+        }
+
+        public String getTemplate() {
+            return template;
+        }
+
+        public void setTemplate(String template) {
+            this.template = template;
+        }
+
+    }
+
     public static class Token {
 
         private String as;
@@ -51,10 +90,22 @@ public class ListenerConfig {
 
     }
 
-    private transient URL csUrl;
+    private String id = "appservice-mxisd";
     private String url;
-    private String localpart;
+    private String localpart = "mxisd";
     private Token token = new Token();
+    private List<UserTemplate> users = new ArrayList<>();
+    private Synpase synapse = new Synpase();
+
+    private transient URL csUrl;
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
 
     public URL getUrl() {
         return csUrl;
@@ -80,6 +131,22 @@ public class ListenerConfig {
         this.token = token;
     }
 
+    public List<UserTemplate> getUsers() {
+        return users;
+    }
+
+    public void setUsers(List<UserTemplate> users) {
+        this.users = users;
+    }
+
+    public Synpase getSynapse() {
+        return synapse;
+    }
+
+    public void setSynapse(Synpase synapse) {
+        this.synapse = synapse;
+    }
+
     public void build() {
         try {
             if (StringUtils.isBlank(url)) {
@@ -88,6 +155,10 @@ public class ListenerConfig {
 
             csUrl = new URL(url);
 
+            if (org.apache.commons.lang3.StringUtils.isBlank(getId())) {
+                throw new IllegalArgumentException("Matrix Listener ID is not set");
+            }
+
             if (StringUtils.isBlank(getLocalpart())) {
                 throw new IllegalArgumentException("localpart for matrix listener is not set");
             }