The Bell Beach Surfing Company (BBS) employs a legion of current and former surfers as salespeople who push its surfing-oriented products to various customers (usually retail outlets). This case describes BBS's sales and collection process.

Each BBS salesperson works with a specific group of customers throughout the year. The BBS salespersons act laid back, but they work hard for their sales. Each sale often involves hours of surfing with their customers while they sample all the latest surf wear. Because BBS makes the best surfing products, the customers look forward to the visits from the BBS salespeople and they often buy a lot of gear. Each sale is identified by a unique invoice number and usually involve many different products. Customers pay for each sale in full within 30 days.

1- Draw BPMN activity diagram that describes BBS sales and collection process.

2- Draw a UML class diagram that describes the BBS sales and collection process.