Switch from CloudConvert and keep your code

# was: https://api.cloudconvert.com/v2/jobs and your CloudConvert key. Needs jq.
RES=$(curl -sS https://api.switchfile.io/v2/jobs \
  -H "Authorization: Bearer $SWITCHFILE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tasks": {
      "import": { "operation": "import/url", "url": "https://example.com/talk.mkv" },
      "convert": { "operation": "convert", "input": "import", "output_format": "mp4" },
      "export": { "operation": "export/url", "input": "convert" }
    }
  }')
# Errors come back as {"message", "code"} with the HTTP status, as at CloudConvert.
JOB_ID=$(echo "$RES" | jq -er .data.id) || { echo "$RES" | jq -r '"\(.code): \(.message)"' >&2; exit 1; }

# /wait answers when the job ends, or after a server-side timeout with the job still running.
RES=$(curl -sS --max-time 360 https://api.switchfile.io/v2/jobs/$JOB_ID/wait \
  -H "Authorization: Bearer $SWITCHFILE_API_KEY")
case $(echo "$RES" | jq -r .data.status) in
  finished) echo "$RES" | jq -r '.data.tasks[] | select(.name == "export") | .result.files[0].url' ;;
  error) echo "$RES" | jq -r '.data.tasks[] | select(.status == "error") | "\(.name) failed: \(.code) \(.message)"' >&2; exit 1 ;;
  waiting|processing) echo "Job $JOB_ID is still running: call /wait again or send webhook_url" >&2; exit 1 ;;
  *) echo "$RES" | jq -r '"\(.code): \(.message)"' >&2; exit 1 ;;
esac

// was: https://api.cloudconvert.com/v2 and your CloudConvert key
const BASE = "https://api.switchfile.io/v2";
const headers = {
  Authorization: `Bearer ${process.env.SWITCHFILE_API_KEY}`,
  "Content-Type": "application/json",
};

async function api(path, init = {}) {
  // /wait answers when the job ends or after a server-side timeout; allow a little longer here.
  const res = await fetch(`${BASE}${path}`, { ...init, headers, signal: AbortSignal.timeout(360_000) });
  const body = await res.json().catch(() => ({}));
  // Errors come back as { message, code } with the HTTP status, as at CloudConvert.
  if (!res.ok) throw new Error(`${res.status} ${body.code}: ${body.message}`);
  return body.data;
}

const job = await api("/jobs", {
  method: "POST",
  body: JSON.stringify({
    tasks: {
      import: { operation: "import/url", url: "https://example.com/talk.mkv" },
      convert: { operation: "convert", input: "import", output_format: "mp4" },
      export: { operation: "export/url", input: "convert" },
    },
  }),
});

const done = await api(`/jobs/${job.id}/wait`);
if (done.status === "error") {
  const failed = done.tasks.find((t) => t.status === "error");
  throw new Error(`Task ${failed?.name} failed: ${failed?.code} ${failed?.message}`);
}
if (done.status !== "finished") {
  // Timed out while the job is still running: call /wait again, or send webhook_url with the job.
  throw new Error(`Job ${done.id} is still ${done.status}`);
}
const file = done.tasks.find((t) => t.name === "export").result.files[0];
console.log(file.filename, file.url);

<?php
// composer require guzzlehttp/guzzle
// was: https://api.cloudconvert.com/v2/ and your CloudConvert key
$http = new GuzzleHttp\Client([
    'base_uri' => 'https://api.switchfile.io/v2/',
    'headers' => ['Authorization' => 'Bearer ' . getenv('SWITCHFILE_API_KEY')],
    // /wait answers when the job ends or after a server-side timeout; allow a little longer here.
    'timeout' => 360,
]);

function fail(string $message)
{
    fwrite(STDERR, $message . PHP_EOL);
    exit(1);
}

try {
    $job = json_decode($http->post('jobs', ['json' => ['tasks' => [
        'import' => ['operation' => 'import/url', 'url' => 'https://example.com/talk.mkv'],
        'convert' => ['operation' => 'convert', 'input' => 'import', 'output_format' => 'mp4'],
        'export' => ['operation' => 'export/url', 'input' => 'convert'],
    ]]])->getBody(), true)['data'];
    $done = json_decode($http->get("jobs/{$job['id']}/wait")->getBody(), true)['data'];
} catch (GuzzleHttp\Exception\GuzzleException $e) {
    // HTTP errors carry {"message", "code"} as at CloudConvert; timeouts and network errors have no response.
    $res = $e instanceof GuzzleHttp\Exception\RequestException ? $e->getResponse() : null;
    $body = $res ? json_decode($res->getBody(), true) : null;
    fail('Request failed: ' . (isset($body['code']) ? "{$body['code']}: {$body['message']}" : $e->getMessage()));
}

if ($done['status'] === 'error') {
    foreach ($done['tasks'] as $task) {
        if ($task['status'] === 'error') fail("Task {$task['name']} failed: {$task['code']} {$task['message']}");
    }
}
if ($done['status'] !== 'finished') {
    // Timed out while the job is still running: call /wait again, or send webhook_url with the job.
    fail("Job {$done['id']} is still {$done['status']}");
}
foreach ($done['tasks'] as $task) {
    if ($task['name'] === 'export') echo $task['result']['files'][0]['url'], PHP_EOL;
}

import os
import requests

# was: https://api.cloudconvert.com/v2 and your CloudConvert key
BASE = "https://api.switchfile.io/v2"
headers = {"Authorization": f"Bearer {os.environ['SWITCHFILE_API_KEY']}"}


def api(method, path, **kwargs):
    # /wait answers when the job ends or after a server-side timeout; allow a little longer here.
    # A timeout on our side raises requests.Timeout.
    r = requests.request(method, f"{BASE}{path}", headers=headers, timeout=360, **kwargs)
    if not r.ok:
        # Errors come back as {"message", "code"} with the HTTP status, as at CloudConvert.
        try:
            err = r.json()
        except ValueError:
            err = {}
        raise RuntimeError(f"{r.status_code} {err.get('code')}: {err.get('message')}")
    return r.json()["data"]


job = api("POST", "/jobs", json={"tasks": {
    "import": {"operation": "import/url", "url": "https://example.com/talk.mkv"},
    "convert": {"operation": "convert", "input": "import", "output_format": "mp4"},
    "export": {"operation": "export/url", "input": "convert"},
}})

done = api("GET", f"/jobs/{job['id']}/wait")
if done["status"] == "error":
    failed = next(t for t in done["tasks"] if t["status"] == "error")
    raise RuntimeError(f"Task {failed['name']} failed: {failed['code']} {failed['message']}")
if done["status"] != "finished":
    # Timed out while the job is still running: call /wait again, or send webhook_url with the job.
    raise RuntimeError(f"Job {done['id']} is still {done['status']}")
export = next(t for t in done["tasks"] if t["name"] == "export")
print(export["result"]["files"][0]["url"])