diff --git a/.phase19-state.json b/.phase19-state.json
index 569a50f..76bb696 100644
--- a/.phase19-state.json
+++ b/.phase19-state.json
@@ -1,10 +1,11 @@
 {
   "completed_features": [],
-  "current_feature": "presence-stub",
+  "current_feature": "api-client-phase19",
   "started_at": "2026-05-23T07:42:47.919364",
   "attempted_features": [
     "invitation-flow",
     "rate-limiting-stub",
-    "search-history"
+    "search-history",
+    "presence-stub"
   ]
 }
\ No newline at end of file
diff --git a/GENERATION_LOG.md b/GENERATION_LOG.md
index 3011665..caaf5c9 100644
--- a/GENERATION_LOG.md
+++ b/GENERATION_LOG.md
@@ -2326,3 +2326,20 @@ src/index.ts(27,25): error TS2769: No overload matches this call.
   Overload 2 of 3, '(plugin: FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
     Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
       Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTy
+- `07:47:20` **INFO**   Committed feature presence-stub
+- `07:47:20` **INFO**   Pushed: rc=0
+
+## Phase-3 Feature: api-client-phase19 (2026-05-23 07:47:20)
+
+- `07:47:20` **INFO** Description: API erweitern um invitations, accept, presence
+- `07:47:20` **INFO**   Generating apps/web/src/lib/api.ts (ERWEITERT — behalte ALLES. Füge: createInvitation({email, role}), list…)
+- `07:48:02` **INFO**     wrote 4835 chars in 42.2s (attempt 1)
+- `07:48:02` **INFO** Running tsc --noEmit on api…
+- `07:48:04` **WARN**   tsc errors:
+src/index.ts(27,25): error TS2769: No overload matches this call.
+  Overload 1 of 3, '(plugin: FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTypeProvider>, opts: { ...; }, done: (err?: Error | undefined) => void): void'.
+  Overload 2 of 3, '(plugin: FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTy
diff --git a/apps/web/src/lib/api.ts b/apps/web/src/lib/api.ts
index d080a9d..757826d 100644
--- a/apps/web/src/lib/api.ts
+++ b/apps/web/src/lib/api.ts
@@ -166,42 +166,31 @@ export const api = {
     })
   },
 
-  async listApiKeys() {
-    return request<any[]>("/api-keys")
-  },
-
-  async createApiKey(name: string) {
-    return request("/api-keys", {
+  async createInvitation(data: { email: string; role: "admin" | "user" }) {
+    return request("/invitations", {
       method: "POST",
-      body: JSON.stringify({ name })
+      body: JSON.stringify(data)
     })
   },
 
-  async revokeApiKey(id: string) {
-    return request(`/api-keys/${id}`, {
+  async listInvitations() {
+    return request<any[]>("/invitations")
+  },
+
+  async deleteInvitation(id: string) {
+    return request(`/invitations/${id}`, {
       method: "DELETE"
     })
   },
 
-  async listAuditLog(filters?: Record<string, string>) {
-    const query = filters ? `?${new URLSearchParams(filters).toString()}` : ""
-    return request<any[]>(`/audit-log${query}`)
-  },
-
-  async listEntryComments(entryId: string) {
-    return request<any[]>(`/time-entries/${entryId}/comments`)
-  },
-
-  async createEntryComment(entryId: string, body: string) {
-    return request(`/time-entries/${entryId}/comments`, {
+  async acceptInvite(token: string, name: string, password: string) {
+    return request("/invitations/accept", {
       method: "POST",
-      body: JSON.stringify({ body })
+      body: JSON.stringify({ token, name, password })
     })
   },
 
-  async deleteEntryComment(id: string) {
-    return request(`/comments/${id}`, {
-      method: "DELETE"
-    })
+  async getPresence() {
+    return request<any[]>("/presence")
   }
 }
\ No newline at end of file