Add your choice of product(s) in the cart.
Select Checkout and fill in your contact details.
After filling your details, select Continue to Shipping.
In the shipment selection, select Free Shipping and select continue. A payment dialog box will appear.
At the bottom of the payment dialog box, there is a section titled as Offers Available.
In that section, select your preferred method of payment and click on apply. As soon as you apply the offer, you’ll see discounted value at the top of the payment box.