curl -X POST "https://olive-gateway-a6ba.onrender.com/api/v1/cards/OLIV0001/unblock" \
  -H "Authorization: Bearer olive_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "pin": "1234"
  }'

{
  "success": true,
  "message": "Card unblocked successfully",
  "card": {
    "serial": "OLIV0001",
    "status": "ACTIVE",
    "unblocked_at": "2025-01-20T15:30:00Z",
    "unblocked_by": "admin@olive.sl"
  }
}