No-code HTTP step: submit a Wan 3.0 job and get a callback_url

Any automation tool that can send an HTTP request and receive a webhook can generate Wan 3.0 video on Sume. Add one HTTP step that POSTs to https://api.sume.com/v1/videos with an Authorization: Bearer header and a JSON body, set callback_url to a webhook URL your tool gives you, and a second flow runs when the clip is done.

The callback_url must be HTTPS. Sume sends its own webhook envelope with an x-sume-webhook-signature header, not the OpenRouter format (video generation docs).

The request step

Method POST, URL https://api.sume.com/v1/videos, header Authorization: Bearer <key>, header Content-Type: application/json, and a body like this. Map the prompt and the image URL from the row that triggered the flow.

{
  "model": "wan-3.0",
  "prompt": "Slow push-in on the product, soft studio light",
  "duration": 5,
  "resolution": "720p",
  "frame_images": [{
    "type": "image_url",
    "image_url": {"url": "https://example.com/row-photo.jpg"},
    "frame_type": "first_frame"
  }],
  "callback_url": "https://hooks.example.com/video-done"
}

What to store

The submit returns 202 with id, polling_url, status and model. Write the id back to the row so the webhook flow can match the finished clip to it. If your tool cannot receive webhooks, run a scheduled flow that calls GET /v1/videos/{id} and checks status.

Protect the spend

A spreadsheet that triggers a paid job per row can run away. Add a column that marks a row as done, filter on it, and send an Idempotency-Key equal to the row id so a retry of the same row returns the original job rather than starting a second one. A reused key with a different body returns 409 (video generation docs).

Checking the webhook

Treat the callback as a hint, not proof. When it arrives, confirm the job with a GET on the polling URL before you publish the file, and verify x-sume-webhook-signature with your signing secret if your tool lets you run a code step. Never accept a callback when the secret is empty.

Practical notes

A good starting flow has three steps: a trigger when a row is added, the HTTP step above, and a webhook-triggered flow that writes the finished video link back. Test it on one row at 480p, where a 5-second job is $0.32, before you turn it on for a whole sheet.

If something fails, the poll response has an error field with a public message, for example when an image URL cannot be downloaded. Put that message in a status column so a person can fix the row.