Vercel AI SDK + CreativeAI

// app/api/video/route.ts — Video generation from Next.js
export async function POST(req: Request) {
  const { prompt, image_url } = await req.json();

  const response = await fetch("https://api.creativeai.run/v1/video/generations", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.CREATIVEAI_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      model: "kling-v3",           // or seedance-1.5, veo-3.1
      prompt,
      ...(image_url && { image_url }),  // image-to-video if provided
      duration: "5",
      aspect_ratio: "16:9",
      webhook_url: `${process.env.NEXT_PUBLIC_APP_URL}/api/webhooks/video`,
    }),
  });

  const job = await response.json();
  return Response.json({ id: job.id, status: job.status });
}

// app/api/webhooks/video/route.ts — Receive render completion
import { createHmac } from "crypto";

export async function POST(req: Request) {
  const body = await req.text();
  const signature = req.headers.get("x-webhook-signature") ?? "";

  // Verify HMAC-SHA256 signature
  const expected = createHmac("sha256", process.env.CREATIVEAI_API_KEY!)
    .update(body)
    .digest("hex");

  if (signature !== expected) {
    return new Response("Unauthorized", { status: 401 });
  }

  const event = JSON.parse(body);
  // event.status === "completed" → event.video_url has the result
  // Store result, notify user, etc.

  return Response.json({ received: true });
}