Click To Copy Functionality
WP Coupons And Deals plugin comes with the functionality - Click to Copy.
When your users click on the coupon code, the coupon code will be copied to their clipboard so they can just paste it on their checkout.
While the coupon is copied, your target link (affiliate link) will be opened in a new tab.
Here's an example. Click on the coupon code below to see how it works.
So, you are making it easier for your users to use your coupon code while making sure they go through your affiliate link and you get the affiliate commission.