I have a store in opencart 2.0.3.1
I am selling products and every 5 reais spent the customer earns 1 points.
When the customer will use these points and he chooses to withdraw in the store the product he bought with the points the value of this purchase can result in 0 . This is the problem when the value is 0 it does not skip the checkout part nor does it display any information or option that the request is already ok to proceed.
Simply the store shows the secure page as payment method without the price and does not let you finish the checkout for this reason.
Has anyone gone through this or do you know how I add a form of payment for when the value is 0 or negative in specific?