This collection is for the [Holding Orders and Paying Later](https://duffel.com/docs/guides/holding-orders-and-paying-later) guide. Holding an order allows you to hold space on a flight and pay for it at a later time. For example, perhaps your customer is booking a flight for a business trip and wants to hold their seat while they wait for their manager to approve the trip. In the industry, holding an order is sometimes referred to as deferred ticketing. We refer to orders that can be paid after booking as “Hold Orders”. You hold an order by creating an order without supplying payment, and then paying for it by a particular time indicated in the order.

Versori has established itself as the third generation of Integration Platform as a Service (iPaaS). Versori builds custom integrations for its customers using an intuitive visual user interface.

Versori’s connector engine means there is no dependency on an existing library of apps, all you need to start is the documentation of the app or system you want to integrate to.