3. Data Diagram

The following data diagram illustrates how the user data is going to be stored on the server. 

1. Accio_userdetails: records the unique details of a person. Later this same table will be used to reference other tables based on the user_id
   
2. Accio_purchases: records the purchase details such as the amount paid and the product that has been purchased.
   
3. Accio_products: lists the product price, the quantity purchased and it's price.