Sometimes we will partner with others to offer a discounted service or additional functionality. We do this by providing a link which must be clicked before installing our app.
Unfortunately the discounts we provide to affiliates are a one time use and cannot be used again once the app has ben installed. They also have to be installed using the link that the affiliate provides so if you have installed without using the link it will no longer work
This is due to technical limitations with the Shopify billing engine.