diff --git a/front/src/Api/iframe/chatmessage.ts b/front/src/Api/iframe/chatmessage.ts
new file mode 100644
index 00000000..934fb1b1
--- /dev/null
+++ b/front/src/Api/iframe/chatmessage.ts
@@ -0,0 +1,35 @@
+import { ChatEvent } from '../Events/ChatEvent'
+import { isUserInputChatEvent, UserInputChatEvent } from '../Events/UserInputChatEvent'
+import { registerWorkadventureCommand, registerWorkadvntureCallback, sendToWorkadventure } from "./iframe-registration"
+
+let chatMessageCallback: (event: string) => void | undefined
+
+class WorkadvntureChatCommands {
+
+    sendChatMessage(message: string, author: string) {
+        sendToWorkadventure({
+            type: 'chat',
+            data: {
+                'message': message,
+                'author': author
+            } as ChatEvent
+        })
+    }
+
+    /**
+     * Listen to messages sent by the local user, in the chat.
+     */
+    onChatMessage(callback: (message: string) => void) {
+        chatMessageCallback = callback
+    }
+}
+
+export const commands = registerWorkadventureCommand(new WorkadvntureChatCommands())
+export const callbacks = registerWorkadvntureCallback([{
+    callback: (event: UserInputChatEvent) => {
+        chatMessageCallback?.(event.message)
+    },
+    type: "userInputChat",
+    typeChecker: isUserInputChatEvent
+}])
+
diff --git a/front/src/Api/iframe/iframe-registration.ts b/front/src/Api/iframe/iframe-registration.ts
new file mode 100644
index 00000000..ceb6daf4
--- /dev/null
+++ b/front/src/Api/iframe/iframe-registration.ts
@@ -0,0 +1,30 @@
+import { IframeEvent, IframeEventMap, IframeResponseEventMap } from '../Events/IframeEvent';
+import { registeredCallbacks, WorkAdventureApi } from "../../iframe_api"
+export function registerWorkadventureCommand<T>(commnds: T): T {
+    const commandPrototype = Object.getPrototypeOf(commnds);
+    const commandClassPropertyNames = Object.getOwnPropertyNames(commandPrototype).filter(name => name !== "constructor");
+    for (const key of commandClassPropertyNames) {
+        window.WA[key as keyof WorkAdventureApi] = commandPrototype[key] as never
+    }
+    return commnds
+}
+
+
+export function registerWorkadvntureCallback<T extends Function>(callbacks: Array<{
+    type: keyof IframeResponseEventMap,
+    typeChecker: Function,
+    callback: T
+}>) {
+    for (const callback of callbacks) {
+        registeredCallbacks[callback.type] = {
+            typeChecker: callback.typeChecker,
+            callback: callback.callback
+        }
+    }
+    return callbacks
+}
+
+
+export function sendToWorkadventure(content: IframeEvent<keyof IframeEventMap>) {
+    window.parent.postMessage(content, "*")
+}
\ No newline at end of file
diff --git a/front/src/Api/iframe/zone-events.ts b/front/src/Api/iframe/zone-events.ts
new file mode 100644
index 00000000..11df18d9
--- /dev/null
+++ b/front/src/Api/iframe/zone-events.ts
@@ -0,0 +1,27 @@
+import { EnterLeaveEvent, isEnterLeaveEvent } from '../Events/EnterLeaveEvent'
+import { registerWorkadventureCommand, registerWorkadvntureCallback, sendToWorkadventure } from "./iframe-registration"
+
+class WorkadventureZoneCommands {
+
+    onEnterZone(name: string, callback: () => void): void {
+
+
+    }
+    onLeaveZone(name: string, callback: () => void): void {
+
+    }
+
+}
+
+
+
+
+export const commands = registerWorkadventureCommand(new WorkadventureZoneCommands())
+export const callbacks = registerWorkadvntureCallback([{
+    callback: (enterEvent: EnterLeaveEvent) => {
+
+    },
+    type: "enterEvent",
+    typeChecker: isEnterLeaveEvent
+},])
+
diff --git a/front/src/iframe_api.ts b/front/src/iframe_api.ts
index df37e53d..fbf3ec4f 100644
--- a/front/src/iframe_api.ts
+++ b/front/src/iframe_api.ts
@@ -1,5 +1,5 @@
 import type { ChatEvent } from "./Api/Events/ChatEvent";
-import { isIframeResponseEventWrapper } from "./Api/Events/IframeEvent";
+import { IframeEvent, IframeEventMap, IframeResponseEventMap, isIframeResponseEventWrapper } from "./Api/Events/IframeEvent";
 import { isUserInputChatEvent, UserInputChatEvent } from "./Api/Events/UserInputChatEvent";
 import { Subject } from "rxjs";
 import { EnterLeaveEvent, isEnterLeaveEvent } from "./Api/Events/EnterLeaveEvent";
@@ -10,9 +10,19 @@ import type { OpenTabEvent } from "./Api/Events/OpenTabEvent";
 import type { GoToPageEvent } from "./Api/Events/GoToPageEvent";
 import type { OpenCoWebSiteEvent } from "./Api/Events/OpenCoWebSiteEvent";
 
-interface WorkAdventureApi {
-    sendChatMessage(message: string, author: string): void;
-    onChatMessage(callback: (message: string) => void): void;
+const importType = Promise.all([
+    import("./Api/iframe/chatmessage"),
+    import("./Api/iframe/zone-events")
+])
+type UnPromise<P> = P extends Promise<infer T> ? T : P
+
+type WorkadventureCommandClasses = UnPromise<typeof importType>[number]["commands"];
+type KeysOfUnion<T> = T extends T ? keyof T : never
+type ObjectWithKeyOfUnion<O, Key> = O extends O ? (Key extends keyof O ? O[Key] : never) : never
+
+type WorkAdventureApiFiles = { [Key in KeysOfUnion<WorkadventureCommandClasses>]: ObjectWithKeyOfUnion<WorkadventureCommandClasses, Key> };
+
+export interface WorkAdventureApi extends WorkAdventureApiFiles {
     onEnterZone(name: string, callback: () => void): void;
     onLeaveZone(name: string, callback: () => void): void;
     openPopup(targetObject: string, message: string, buttons: ButtonDescriptor[]): Popup;
@@ -26,10 +36,15 @@ interface WorkAdventureApi {
     removeBubble(): void;
 }
 
-declare global {
-    // eslint-disable-next-line no-var
-    var WA: WorkAdventureApi
 
+
+
+declare global {
+
+    interface Window {
+        WA: WorkAdventureApi
+    }
+    let WA: WorkAdventureApi
 }
 
 type ChatMessageCallback = (message: string) => void;
@@ -172,14 +187,7 @@ window.WA = {
         popups.set(popupId, popup)
         return popup;
     },
-    /**
-     * Listen to messages sent by the local user, in the chat.
-     */
-    onChatMessage(callback: ChatMessageCallback): void {
-        userInputChatStream.subscribe((userInputChatEvent) => {
-            callback(userInputChatEvent.message);
-        });
-    },
+    ...({} as WorkAdventureApiFiles),
     onEnterZone(name: string, callback: () => void): void {
         let subject = enterStreams.get(name);
         if (subject === undefined) {
@@ -196,6 +204,7 @@ window.WA = {
         }
         subject.subscribe(callback);
     },
+
 }
 
 window.addEventListener('message', message => {
@@ -209,6 +218,12 @@ window.addEventListener('message', message => {
 
     if (isIframeResponseEventWrapper(payload)) {
         const payloadData = payload.data;
+
+        if (registeredCallbacks[payload.type] && registeredCallbacks[payload.type]?.typeChecker(payloadData)) {
+            registeredCallbacks[payload.type]?.callback(payloadData)
+            return
+        }
+
         if (payload.type === 'userInputChat' && isUserInputChatEvent(payloadData)) {
             userInputChatStream.next(payloadData);
         } else if (payload.type === 'enterEvent' && isEnterLeaveEvent(payloadData)) {