Inventory- inventoryID: String- Product List- check Stock()- deduct Item()- add Item()

Order- OrderID: String- Order Date- Status: String- sub total: float- calculateTotal()- updateStatus()

Authentication- userID: String- password: String- validate()

Product- ProductID: String- name: String- price: float- Quantity: int- check Availability()- update Stock()

Payment- payID: String- amount: float- payment Date- status: String- Process Payment()- generate invoice()

mushi