Whop apps are embedded into the site using iFrames. This SDK provides a type-safe way for you to communicate with the Whop application using a request/response style API powered by window.postMessage. Since this package relies on window.postMessage, it only works in Client Components.

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Setup

The main function exported from this package is the createAppIframeSDK function. When called, this function sets up a listener for messages from the main Whop site, using window.on('message', ...).

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Next.js Setup

If you’re using Next.js, you’ll need to make sure that you’re only calling createAppIframeSDK on the client. You can do this by using a client layout defined in the root of your app. Here is an example of the project structure: 
app/
├─ layout.tsx
├─ layout.client.tsx
lib/
├─ iframe.ts
app/layout.tsx
import { ClientLayout } from "./layout.client";

export default function RootLayout({
  children,
}: {
  children: React.ReactNode,
}) {
  return (
    <html lang="en">
      <body>
        <ClientLayout>{children}</ClientLayout>
      </body>
    </html>
  );
}
Next.js Will mount this code on the client:
app/layout.client.tsx
"use client"; // this line is important
import { FC, PropsWithChildren } from "react";
import "@/lib/iframe";

export const ClientLayout: FC<PropsWithChildren> = ({ children }) => {
  return <>{children}</>;
};
We declare the SDK in a separate file, such that we can import it throughout the rest of the app.
lib/iframe.ts
import { createAppIframeSDK } from "@whop-apps/sdk";

export const WhopApp = createAppIframeSDK({
  onMessage: {},
});
We have now setup the SDK and iFrame.