How can the refill coupon be used by the partner's end user?

The refill coupon can be used in two ways:

1. On the checkout page: The end user enters the refill coupon code on the checkout page. Upon successful entry, a success message is displayed to the user.
2. Using the "Redeem Free data" button on the "More details" page for the line: The end user clicks the "Redeem Free data" button on the "More details" page for the specific line. They then enter the refill coupon code in the provided pop-up. Similar to the checkout page, a success message is displayed to the user upon successful entry.