diff --git a/CLAUDE.md b/CLAUDE.md
index 02c9e98..48755cd 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -232,7 +232,17 @@ Reactions: `toggleReaction`, `listReactions` · Read state: `markAsRead`
 
 ### 16. Push Notifications Module (1 function)
 
-`send` — `{ userIds: string[], title: string, body: string, data?: Record<string, any> }`.
+`send` — `{ userIds: string[], title: string, body: string, data?: Record<string, any> }`
+plus optional rich-payload fields, each mapped to whichever platform(s) support
+it and ignored elsewhere: `sound`, `badge` (iOS), `channelId` (Android),
+`priority` (`high`/`normal`), `subtitle` (iOS), `imageUrl`, `tag`, `collapseId`,
+`threadId` (iOS), `ttl` (seconds), `mutableContent` (iOS). `imageUrl` works
+out-of-the-box on Android/Web; on iOS it also needs a Notification Service
+Extension in the app (and auto-sets `mutable-content`). Android sound on 8+ is
+owned by the channel, so pair `sound` with a client-created `channelId`. The
+SDK forwards the whole body unreshaped — the server zod schema
+(`server/src/v7/validation/push-notifications/push-notifications.schema.ts`) is
+the source of truth.
 Fans a push out across all of the listed users' registered devices (APNs/FCM/Web
 Push); returns per-user, per-device results (`{ results: { [userId]: { platform, success, reason? }[] } }`).
 Devices for a user with no registered devices come back as an empty array, not
diff --git a/__tests__/push.test.ts b/__tests__/push.test.ts
index 8e0afbf..f1f99a4 100644
--- a/__tests__/push.test.ts
+++ b/__tests__/push.test.ts
@@ -19,6 +19,31 @@ describe("node-sdk push — request shaping", () => {
     });
   });
 
+  it("send forwards the rich payload fields verbatim (no reshaping or dropping)", async () => {
+    const { client, projectInstance } = makeClient();
+    const props = {
+      userIds: ["u1"],
+      title: "New message",
+      body: "You have a new message",
+      data: { conversationId: "c1" },
+      sound: "notification.wav",
+      badge: 3,
+      channelId: "messages",
+      priority: "high" as const,
+      subtitle: "from Alice",
+      imageUrl: "https://ex.com/img.png",
+      tag: "conv-c1",
+      collapseId: "conv-c1",
+      threadId: "conv-c1",
+      ttl: 3600,
+      mutableContent: true,
+    };
+
+    await send(client, props);
+
+    expect(projectInstance.post).toHaveBeenCalledWith("/push-notifications/send", props);
+  });
+
   it("send returns the typed response passed through as-is", async () => {
     const { client, projectInstance } = makeClient();
     const responseBody = {
diff --git a/src/modules/push/send.ts b/src/modules/push/send.ts
index ca355b4..bf8ae9f 100644
--- a/src/modules/push/send.ts
+++ b/src/modules/push/send.ts
@@ -6,6 +6,58 @@ export interface SendPushProps {
   title: string;
   body: string;
   data?: Record<string, any>;
+  /**
+   * Sound file to play on the device. iOS plays it directly (APNs `sound`);
+   * on Android 8+ the sound is owned by the notification channel, so pair this
+   * with `channelId` (the app must create that channel with the sound set);
+   * Web forwards it to your service worker.
+   */
+  sound?: string;
+  /** iOS app-icon badge count (APNs `badge`). No Android equivalent. */
+  badge?: number;
+  /**
+   * Android notification channel id (FCM). The channel must be created
+   * client-side; on Android 8+ it governs sound, importance, and vibration.
+   */
+  channelId?: string;
+  /**
+   * Delivery priority. `high` (default) wakes the device for time-sensitive
+   * pushes; `normal` is power-considerate. Maps to APNs `apns-priority` and
+   * FCM `android.priority`.
+   */
+  priority?: "high" | "normal";
+  /** iOS subtitle line shown under the title (APNs `alert.subtitle`). */
+  subtitle?: string;
+  /**
+   * Rich/big-picture image URL. Works out of the box on Android (FCM) and Web.
+   * On iOS it additionally requires a Notification Service Extension in your
+   * app; the URL is forwarded and `mutable-content` is set automatically.
+   */
+  imageUrl?: string;
+  /**
+   * Display-replace key so notifications collapse in the UI instead of
+   * stacking (FCM `android.notification.tag`, Web `tag`). Use a per-conversation
+   * value to keep one entry per thread.
+   */
+  tag?: string;
+  /**
+   * Transport-level collapse identifier (APNs `apns-collapse-id`, FCM
+   * `collapse_key`) — a newer push supersedes an undelivered one with the same id.
+   */
+  collapseId?: string;
+  /** iOS notification grouping (APNs `thread-id`). */
+  threadId?: string;
+  /**
+   * Time-to-live in seconds for offline devices (APNs `apns-expiration`,
+   * FCM `android.ttl`). After this window the provider stops retrying.
+   */
+  ttl?: number;
+  /**
+   * iOS `mutable-content` flag, letting your Notification Service Extension
+   * modify the payload (e.g. attach `imageUrl`). Set implicitly when `imageUrl`
+   * is provided.
+   */
+  mutableContent?: boolean;
 }
 
 export async function send(