curl --request POST 'https://api.voicecheap.ai/v1/actions/thumbnails_upload_sign_parts' \
  --header "x-api-key: $VOICECHEAP_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{"requestId":"f54381cc-403f-4d05-84e8-42d3546ec40b","uploadId":"c547fb7f-f334-46a8-a8bb-80b5b343889a","partNumbers":[1,2]}'

const input = {
  requestId: 'f54381cc-403f-4d05-84e8-42d3546ec40b',
  uploadId: 'c547fb7f-f334-46a8-a8bb-80b5b343889a',
  partNumbers: [1, 2],
};
const response = await fetch('https://api.voicecheap.ai/v1/actions/thumbnails_upload_sign_parts', {
  method: 'POST',
  headers: {
    'x-api-key': process.env.VOICECHEAP_API_KEY,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify(input),
});
const body = await response.json();
if (!response.ok) throw new Error(body.code + ': ' + body.message);
console.log(body);

import os
import requests

response = requests.post(
    "https://api.voicecheap.ai/v1/actions/thumbnails_upload_sign_parts",
    headers={"x-api-key": os.environ["VOICECHEAP_API_KEY"]},
    json={"requestId": "f54381cc-403f-4d05-84e8-42d3546ec40b", "uploadId": "c547fb7f-f334-46a8-a8bb-80b5b343889a", "partNumbers": [1, 2]},
    timeout=120,
)
body = response.json()
if not response.ok:
    raise RuntimeError(f"{body.get('code')}: {body.get('message')}")
print(body)

{
  "data": {
    "presignedUrls": [
      {
        "partNumber": 1,
        "url": "https://uploads.example.com/uploads/example-user/2502829e-3fde-4aad-b3c7-ce0f779fa2e6-reference.png?partNumber=1&uploadId=example-upload&signature=example-signature"
      },
      {
        "partNumber": 2,
        "url": "https://uploads.example.com/uploads/example-user/2502829e-3fde-4aad-b3c7-ce0f779fa2e6-reference.png?partNumber=2&uploadId=example-upload&signature=example-signature"
      }
    ]
  },
  "requestId": "f54381cc-403f-4d05-84e8-42d3546ec40b"
}

{
  "data": {
    "requestId": "f54381cc-403f-4d05-84e8-42d3546ec40b",
    "operation": "thumbnails_upload_sign_parts",
    "createdAt": 1792144800000,
    "updatedAt": 1792144820000,
    "status": "running",
    "pollAfterSeconds": 5
  },
  "requestId": "f54381cc-403f-4d05-84e8-42d3546ec40b"
}

{
  "data": {
    "requestId": "f54381cc-403f-4d05-84e8-42d3546ec40b",
    "operation": "thumbnails_upload_sign_parts",
    "createdAt": 1792144800000,
    "updatedAt": 1792144820000,
    "status": "completed",
    "resultStored": false,
    "message": "The action completed. Retrieve its output from the corresponding history or resource action."
  },
  "requestId": "f54381cc-403f-4d05-84e8-42d3546ec40b"
}