Coupon Application Flow *

1. User Login

   • Verify user credentials.

   • Redirect to the home page upon successful login.

2. Select Coupon

   • Display available coupons.

   • Allow the user to choose a coupon.

3. Coupon Validation

   • Check if the coupon is valid.

   • Ensure it is not expired.

   • Confirm user eligibility for the coupon.

4. Apply Coupon

   • Apply coupon discount to the user's purchase.

   • Update the purchase total.

5. Payment

   • The user proceeds to pay with the discounted total.

   • Validate payment details.

6. Confirmation

   • Confirm the successful transaction.

   • Email receipt and coupon details to the user.