You can assign an existing customer as a lifetime referrer for an affiliate (PRO, with lifetime commission enabled). While the link is active, all of that customer’s orders are attributed to the affiliate, even if they do not re-use the coupon code. Editing or removing a link only affects future orders — commission already granted on past orders is not changed.

No coupon discount is applied to those later orders unless the customer actually uses the coupon.

From the View Affiliate page (recommended)

This is the quickest way, from View and Manage Affiliate Users:

1. Go to Coupon Affiliates → Affiliate Users and open the affiliate.
2. Open the Lifetime tab (Lifetime Customers).
3. Click Link a Customer.
4. Search for the customer by name, username or email.
5. Choose which of the affiliate’s coupons to link.
6. Optionally set an expiry date. Leave blank for no expiry.
7. Click Link Customer.

You can filter the list by status. The tab also shows how many customers are linked, active, expired, or never expire. You can edit the linked coupon and expiry date on an existing row.

If none of the affiliate’s coupons have lifetime commission enabled, you will see a notice that a link made here would never earn anything. Enable it on the coupon itself, or for all coupons under Settings → Commission.

From the customer’s WordPress user profile

Alternatively, go to the Users list in the admin area, edit the user profile for the customer, and open the Coupon Affiliates – Lifetime Affiliate Settings section. Enter the coupon code for the affiliate.