Hi,
There is no option to do that. But if you develop a custom plugin, you could have it.
The simplest I think would be to duplicate your payment method(s) and rename the copy to indicate that the customer can pay only a fraction of the price to secure it and then have a custom plugin of the group "hikahop" implementing the onAfterCartProductsLoad trigger:
www.hikashop.com/support/documentation/6...fterCartProductsLoad
In that trigger, you would simply change the price of the products in $cart->products and the total of the cart in $cart->total based on which payment method has been selected by the customer in $cart->cart_payment_id