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Online Shop - Coggle Diagram

- - - - Store all their information into the user's database
      - Add a new user to the database
  - - - Check username is in the database
        
        If not, say incorrect password or username
        
        If yes, check the password corresponds with that user
        
        If yes, log them in and display their name on the screen.
        
        If no, say incorrect password or username
- - - - Users can pick which product and what quantity to add. If the add to cart button is pressed, say there is a product in your cart. (make sure you can't order 0 products to cart.
        
        Check whether the product has been added to cart has been added before.
        
        If yes, add the quantity of the previously ordered with the recently ordered product together, then get the product id, quantity and price, and send it to the cart page.
        
        If no, get the product id, quantity and price, and send it to the cart page
- - - - Display the product, unit price, quantity, subtotal and then total price.
        
        When the buy button is pressed, Check whether the payment info has been completed.
        
        If yes, charge the user and show a thank you for purchasing message. Give option to purchase more as well.
        
        If no, send them to that page. Then after they fill it out, charge them and show them the thank you for purchasing message. Give option to purchase more as well.