AddItemToCart adds an item to the user's cart.

CreateProduct handles the creation of a new product.

CreateRegion handles the creation of a new region.

GetCart retrieves the user's cart with total price.

GetProducts retrieves all products from the database.

GetRegions retrieves all regions from the database.

Register function for user registration.

RemoveItemFromCart removes an item from the cart.

UpdateCartItem updates the quantity of a specific item in the cart.