Compatible vouchers only if the order amount is greater than x

[marloru]

Hello,

we are developing a loyalty points module.

The requirements of our customer is to generate vouchers of 10.-€ discount for every 100 points earned

If the customer gets for example 3 vouchers of 10.- € discount, he can only use 1 voucher if the order is less than 75.- €, but he can use 2 or 3 if the order is greater than 75.- €

We are faced with the problem of defining the incompatibility of vouchers. That is to say

Voucher1 - 10- € discount

Voucher2 - 10.- € discount

Voucher3 - 10.- € discount

If the order amount is less than € 75, the vouchers Voucher1 , Voucher2 and Voucher3 cannot be used at the same time

If the order amount is greater than € 75, the vocuers Voucher1 , Voucher2 and Voucher3 can be used at the same time.

Any ideas how to configure this functionality?

Thanks.

Regards

Mar