product_transac-class: Product Transaction
In Samantha-Lui/EZRecords: Easy Bookkeeping and Stock Management for Retails

product_transac is an S4 class to represent a transaction record of an order in a business transaction log.

date: A Date object describing the date of the transaction.
transac: A character string describing the nature of the transaction with values 'credit' and 'debit'.
catgory: A character string representing whether the order is a 'purchase' or a 'sale'.
descrp: An all_items object representing all items in the order.
supplier_customer: A character string representing the supplier/customer of the transaction.
order_no: A character string representing the order number of the transaction.
value: A numeric value representing the value of the items in the order.
shipment: A numeric value representing the handling and shipment cost for the order.
total: A numeric value representing the total amount in the transaction.
time_stamp: A POSIXt object describing the time when the transaction record is created.

## Not run: a_transaction <- new('product_transac', date = Sys.Date(), transac = 'credit',

category = 'sale', descrp = shopping_cart, supplier_customer = 'Amazon', order_no = 'A12345',

value = 100, tax = 9.75, shipment = 12.99, total = 122.74, time_stamp = Sys.time())
## End(Not run)