Autocreate order based on (e.g.) url

Hi,

in a different program invoices are send out to customers, but we would like to use Hikashop for those invoice payment. Now we can try to create an import / export for those invoices (is there an api available?) but is it also possible to auto create an order?

e.g. we have a product with the custom fields customer_invoice_id and amount

We click on a link like /hikashop/order?product=1&customer_invoice_id=123&amount=1200

The product is added to the basket with customer_invoice_id and amout prefilled. Customer only has to checkout & pay their invoice.

Or is there perhaps another solution? (API)