Billing

-date

-totalAmount

-paymentMethod

+viewBill()

+printBill()

-shopName

-address

-contactNo

+manageCustomer()

+manageBilling()

+manageRepair()

-stockId

-itemName

-brand

-quantity

-price

+addItem()

+updateItem()

+deleteItem()

-customerId

-name

-phoneNo

-email

-address

+addCustomer()

+updateCustomer()

+viewCustomer()

-repairId

-deviceType

-issueDesc

-status

-cost

+createRepair()

+updateStatus()

+closeRepair()