curl -X POST https://crypto.cucu.ai/api/v1/merchants/me/charges/CHG-20260125-00042/cancel \
  -H "X-API-Key: sk_live_xxxx"

const response = await fetch(
  'https://crypto.cucu.ai/api/v1/merchants/me/charges/CHG-20260125-00042/cancel',
  { method: 'POST', headers: { 'X-API-Key': 'sk_live_xxxx' } }
);
const data = await response.json();

import requests

response = requests.post(
    'https://crypto.cucu.ai/api/v1/merchants/me/charges/CHG-20260125-00042/cancel',
    headers={'X-API-Key': 'sk_live_xxxx'}
)
print(response.json())

{
  "charge_id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "status": "cancelled"
}

{
  "detail": "charge not found"
}

{
  "detail": "Cannot cancel a completed charge"
}