Reward app

I am looking for a reward app that would be able to do the following:

• for every 50€ spent on the website, the app would need to emit a 10€ voucher to the customer (if he spends 100€ - 2 vouchers of 10€, for 150€ - 3x vouchers of 10€ and so on),

• the vouchers need to be available to the customer for use for a limited period of time

• the number of vouchers that can be used per order also needs to be conditioned by the amount of the order. If the new order is over 50€, the customer would be able to use one voucher, if the new order is over 100€, the customer would be able to use 2 x 10€ vouchers, and so on.

• the app would ideally send reminder emails to the customer, letting him know when the time to use the voucher almost ran out.