Admin can set discount rules based on Payment Method.
For making this discount rule select Discount Rules tab.
Now choose Payment Rules
Now you can choose Add New Rule.
Select the payment method that you want to give discount. On the customer’s side if he/she chooses the same payment method way to pay at your site then the conditions of the discount rule are met and the customer gets the discount.
Fill Rule, Restrictions and Validity tabs accordingly.
After saving the rule it can be seen in the given table below.
Now you have to give permission to your rule to give discount on the product you have chosen.
Click on the Setting Tab.
Check Payment Rule as shown below.
Now your Rules are active and if anyone pay through the payment method you have selected the discount is applied.
The Discount can be seen on the checkout page.
Now whenever you want to disable this discount rule, you don’t have to delete it, just go to Setting Tab and uncheck this rule.