Hi,
Well, you can just create a product in HikaShop with custom fields of the table "item" (Business edition).
And then, from your reservation system, you can redirect to the add to cart URL of that product with the information of the reservation in the custom item field(s).
Here is a thread where we talk about that:
www.hikashop.com/forum/2-general-talk-ab...ct-fields.html#16216
That way, the customer will be directed to the checkout for the payment.
Then, you can create a small plugin inplementing the onAfterOrderUpdate trigger (
www.hikashop.com/support/documentation/6...l#onAfterOrderUpdate
) so that you can validate the reservation in the reservation system when the payment is done based on the data in the custom item fields of the product in the order.
So I think it's totally doable with HikaShop.