curl -X POST "https://server.smartlead.ai/api/v1/client/save?api_key=YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "admin@acme.com",
    "name": "Acme Agency",
    "permission": ["campaigns", "email_accounts", "leads"],
    "is_credit_assigned": true,
    "email_credits": 10000,
    "lead_credits": 5000
  }'

{
  "ok": true,
  "data": {
    "id": 301,
    "name": "Acme Agency",
    "email": "admin@acme.com",
    "api_key": "cl_xxxxxxxxxxxxxxxx",
    "created_at": "2025-12-01T10:00:00.000Z"
  }
}

{
  "message": "Invalid API Key"
}