public async Task Put(int id, Order order)
{
var dbOrder = await _repo.Get(id);
if (dbOrder == null)
{
throw new Exception($"Order with id: {id} does not exist!");
}
if (dbOrder.ProcessedAt != null)
{
throw new Exception("Cannot update an order that has already been processed!");
}
await _repo.Put(id, order);
}
