This discount requirement can be used with any other discount type.

To use this discount rule, the discount requirement type should be configured as Must be assigned to payment methods and need to select a Payment method on which you want this discount rule to be applied as displayed in the image below.

discount requirement for nopcommerce on payment method plugin

Once saved, the discount requirement will be added to the discount as displayed in the image below.

applied requirement for nopcommerce plugin discount rule on payment method

That's all you need to do in order to use this discount requirement in your nopCommerce store.