curl --request POST 'https://api.voicecheap.ai/v1/actions/thumbnails_download' \
  --header "x-api-key: $VOICECHEAP_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{"generationId":"109c61cb35dbdc01a94aabb3b1a128519ed1f8823800a7a327b9d8d8c2c0e10b"}'

const input = {
  generationId: '109c61cb35dbdc01a94aabb3b1a128519ed1f8823800a7a327b9d8d8c2c0e10b',
};
const response = await fetch('https://api.voicecheap.ai/v1/actions/thumbnails_download', {
  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_download",
    headers={"x-api-key": os.environ["VOICECHEAP_API_KEY"]},
    json={"generationId": "109c61cb35dbdc01a94aabb3b1a128519ed1f8823800a7a327b9d8d8c2c0e10b"},
    timeout=120,
)
body = response.json()
if not response.ok:
    raise RuntimeError(f"{body.get('code')}: {body.get('message')}")
print(body)

{
  "data": {
    "generationId": "109c61cb35dbdc01a94aabb3b1a128519ed1f8823800a7a327b9d8d8c2c0e10b",
    "mimeType": "image/webp",
    "data": "UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAUAmJaQAA3AA/vxvIAA="
  }
}