On the right side they see an Order Summary.(Subtotal of the party, add-ons, Tax and Discounts if any, and also Promotional code)
If the user has any promotional code then click on button will open a box like below, to enter the code and apply the discount.
If the discount is applied successfully then the user can see a successful message and also amount will be deducted from the subtotal, If they want to delete the coupon then they can just click delete icon.
Otherwise and alert message will be displayed as below.
The organizational tax is applied on the Amount (Subtotal – (Discounts + Coupons)).
Clear you cart button will clear the cart completely and take to a page like below from there they can continue shopping by clicking the Continue Shopping button.
Review Cart :
Payment Page : Enter Card details and make a payment.