Secure Shopping

Create a web app consisting of the following pages:

Display at least three items that can be purchased along with a quantity field and price for each. Provide a

submit button that sends the order to the server for processing.

Create an order summary page based on the quantities chosen on the first page. Display a subtotal for

confirmation. When the user confirms the purchase they are sent to the tax calculation page.

Calculate the tax based on the rate in Florence. Display the subtotal, tax, and total. Allow the user to proceed

to the checkout or continue shopping.

To checkout, the user must login first. The password is "imnotbroke". Use the $"$PHP File", authentication.php$,$

which sends authenticated users to the checkout page; invalid users are sent back to the login page.

The checkout page must display the total and simulate payment with a credit card. Only authenticated users

can use the checkout page.

Extra Credit: Validate the credit card number, using the information below, with a message that indicates that

the card was accepted by name or rejected $($e$.$g$.,$ Your VISA ending with $1234$ has been charged $$12\mathrm{.}50$;

Invalid card$).$ You must use a function to validate the card number.

You must use the user's session to track conversational state $($no HTML hidden fields$).$

You must validate all form input to ensure that there are no special characters received as input.

Cards Accepted

MASTERCARD Prefix $=51-55,$ Length $=16$

VISA Prefix $=4,$ Length $=13$ or $16$

AMEX Prefix $=34$ or $37,$ Length $=15$