Dead simple.

curl -X POST https://docrenders.com/render \
  -H "Authorization: Bearer dcr_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"markdown": "# Invoice\n\nDue: **$1,200**", "output": "binary"}' \
  --output invoice.pdf

# Or get a signed URL instead of raw bytes:
# -d '{"markdown": "# Invoice\n\nDue: **$1,200**", "output": "url"}'

// output: "binary" — receive raw PDF bytes (default)
const res = await fetch('https://docrenders.com/render', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer dcr_live_YOUR_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ markdown: '# Invoice\n\nDue: **$1,200**', output: 'binary' }),
});
const pdf = await res.blob();

// output: "url" — receive a signed download URL
const res = await fetch('https://docrenders.com/render', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer dcr_live_YOUR_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ markdown: '# Invoice\n\nDue: **$1,200**', output: 'url' }),
});
const { url, expires_at } = await res.json();

import requests

# output: "binary" — receive raw PDF bytes (default)
res = requests.post(
    'https://docrenders.com/render',
    headers={'Authorization': 'Bearer dcr_live_YOUR_KEY'},
    json={'markdown': '# Invoice\n\nDue: **$1,200**', 'output': 'binary'},
)
with open('invoice.pdf', 'wb') as f:
    f.write(res.content)

# output: "url" — receive a signed download URL
res = requests.post(
    'https://docrenders.com/render',
    headers={'Authorization': 'Bearer dcr_live_YOUR_KEY'},
    json={'markdown': '# Invoice\n\nDue: **$1,200**', 'output': 'url'},
)
print(res.json()['url'])  # expires in 15 minutes