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1. An online service that processes credit card transactions for e-commerce websites.
2. A software application that allows customers to search for and book travel-related services online.
3. A system that allows users to reserve seats or tickets for events and travel.
4. A pricing strategy where prices fluctuate based on demand, availability, and other factors.
5. The rules defined by a service provider regarding how and when customers can cancel their bookings.
6. The process of ensuring that online booking systems function well on mobile devices.