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This hotel computer reservations system cycle process chart example was redesigned from the Wikimedia Commons file: По-запросу.jpg.
[commons.wikimedia.org/ wiki/ File:По-запросу.jpg]
"A computer reservations system or central reservation system (CRS) is a computerized system used to store and retrieve information and conduct transactions related to air travel, hotels, car rental, or activities. ...
Modern GDSes typically allow users to book hotel rooms, rental cars, airline tickets as well as activities and tours." [en.wikipedia.org/ wiki/ Computer_ reservations_ system]
The cycle process diagram example "Hotel reservation system" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Sales Flowcharts solution from the Marketing area of ConceptDraw Solution Park.

"An invoice, bill or tab is a commercial document issued by a seller to a buyer, relating to a sale transaction and indicating the products, quantities, and agreed prices for products or services the seller has provided the buyer.
Payment terms are usually stated on the invoice. These may specify that the buyer has a maximum number of days in which to pay, and is sometimes offered a discount if paid before the due date. The buyer could have already paid for the products or services listed on the invoice.
In the rental industry, an invoice must include a specific reference to the duration of the time being billed, so in addition to quantity, price and discount the invoicing amount is also based on duration. Generally each line of a rental invoice will refer to the actual hours, days, weeks, months, etc., being billed.
From the point of view of a seller, an invoice is a sales invoice. From the point of view of a buyer, an invoice is a purchase invoice. The document indicates the buyer and seller, but the term invoice indicates money is owed or owing. ...
Payment of invoices.
Organizations purchasing goods and services usually have a process in place for approving payment of invoices based on an employee's confirmation that the goods or services have been received.
Typically, when paying an invoice, a remittance advice will be sent to the supplier to inform them their invoice has been paid." [Invoice. Wikipedia]
The flow chart example "Invoice payment process" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Flowcharts solution from the area "What is a Diagram" of ConceptDraw Solution Park.